diff --git a/DECISIONS.md b/DECISIONS.md
index c87d9d2..330f0d1 100644
--- a/DECISIONS.md
+++ b/DECISIONS.md
@@ -2046,3 +2046,9 @@ Implementation decisions not spelled out in `memory-bank/implementation-plan.md`
 
 - **Received as "CR-026 … Phase 26"; stored as CR-028, Phase 28**, decisions CR-026.D1–D4 = plan §0.5.160–0.5.163, with every reference mapped in the CR's numbering note.
 - **"The HQ banner" is the Bridge's "Fleet asleep" panel** (CR-024), the panel that already shows while the fleet sleeps.
+
+## Step 28.1
+
+- **`seen` is on the entry itself**, not a list of seen ids: it's pruned with the entry after 7 days, and catch-up writes entries with the same ids however it's split, so a replayed entry can't come back unseen.
+- **Marking seen takes ids** (what was toasted or shown), ignores unknown ones, and returns how many were newly seen; it's not a manual decision, so a toast doesn't wake the fleet.
+- **The away-period fields (`awaySince`, `lastAbsence`) stay for now**: Step 28.4 decides what the pop-up uses.
diff --git a/apps/web/test/about.test.tsx b/apps/web/test/about.test.tsx
index 5006f4f..4a94933 100644
--- a/apps/web/test/about.test.tsx
+++ b/apps/web/test/about.test.tsx
@@ -23,7 +23,7 @@ describe("about and debug info (Step 10K.10)", () => {
     expect(text).toContain("Build: test");
     // CR-014: the save, its format version and where it is stored; no player id.
     expect(text).toContain("Save: player-1");
-    expect(text).toContain("Save version: 12");
+    expect(text).toContain("Save version: 13");
     expect(text).toContain("Storage: unknown");
     expect(text).not.toContain("Player:");
     expect(text).toMatch(/Game time: \d{4}-\d{2}-\d{2}T/);
diff --git a/apps/web/test/away-summary.test.tsx b/apps/web/test/away-summary.test.tsx
index ffae1e5..0d7a80e 100644
--- a/apps/web/test/away-summary.test.tsx
+++ b/apps/web/test/away-summary.test.tsx
@@ -66,6 +66,7 @@ const flight = (pilotId: string, payout: number, over: Partial<LogEntry> = {}):
     at: FROM + 60_000 + n,
     pilotId,
     shipId: `s${pilotId.slice(1)}`,
+    seen: false,
     kind: "flight",
     dispatchId: `d${n}`,
     deadhead: false,
@@ -162,6 +163,7 @@ describe("the highlights pop-up (Step 25.3, decision 0.5.140)", () => {
         at: FROM + 5,
         pilotId: "p3",
         shipId: "s3",
+        seen: false,
         kind: "discovery",
         locationId: "mars",
       },
@@ -170,6 +172,7 @@ describe("the highlights pop-up (Step 25.3, decision 0.5.140)", () => {
         at: FROM + 6,
         pilotId: "p0",
         shipId: "s0",
+        seen: false,
         kind: "level-up",
         level: 4,
         skillPoints: 1,
diff --git a/apps/web/test/fixtures.ts b/apps/web/test/fixtures.ts
index 622926f..fac28ae 100644
--- a/apps/web/test/fixtures.ts
+++ b/apps/web/test/fixtures.ts
@@ -129,7 +129,7 @@ export function samplePlayerState(overrides: Partial<PlayerState> = {}): PlayerS
 export function logbookFrom(state: PlayerState): LogbookResponse {
   const entries: LogEntry[] = [];
   for (const s of state.summaries) {
-    const who = { at: s.resolvedAt, pilotId: s.pilotId, shipId: s.shipId };
+    const who = { at: s.resolvedAt, pilotId: s.pilotId, shipId: s.shipId, seen: false };
     entries.push({
       id: `${s.dispatchId}:flight`,
       ...who,
@@ -169,6 +169,7 @@ export function logbookFrom(state: PlayerState): LogbookResponse {
       at: ship.shop.until,
       pilotId: ship.pilotId,
       shipId: ship.id,
+      seen: false,
       kind: "upgrade",
       upgradeId: ship.shop.upgradeId,
       level: ship.shop.level,
@@ -181,6 +182,7 @@ export function logbookFrom(state: PlayerState): LogbookResponse {
       at: Date.now(),
       pilotId: null,
       shipId: null,
+      seen: false,
       kind: "goal-ready",
       goalId: goal.id,
     });
diff --git a/apps/web/test/hull-events.test.tsx b/apps/web/test/hull-events.test.tsx
index 7151ab6..21745be 100644
--- a/apps/web/test/hull-events.test.tsx
+++ b/apps/web/test/hull-events.test.tsx
@@ -51,6 +51,7 @@ const event = (over: Partial<Extract<LogEntry, { kind: "event" }>>): LogEntry =>
   at: NOW - 60_000,
   pilotId: "p1",
   shipId: "s1",
+  seen: false,
   kind: "event",
   dispatchId: "d1",
   eventId: "debris-field",
@@ -182,7 +183,16 @@ describe("hull condition and event results on screen (Step 26.7, decisions 0.5.1
     ).toBe("Solar tailwind — Rosa: 1.5 h sooner");
     const book = pilotLogbook(s, [
       event({ eventId: "grateful-client", optionId: "tip", good: true, delayMs: 0, bonus: 800 }),
-      { id: "r1", at: NOW, pilotId: "p1", shipId: "s1", kind: "repair", fromPct: 60, cost: 2_000 },
+      {
+        id: "r1",
+        at: NOW,
+        pilotId: "p1",
+        shipId: "s1",
+        seen: false,
+        kind: "repair",
+        fromPct: 60,
+        cost: 2_000,
+      },
     ]);
     const lines = book.pilots[0]!.entries;
     expect(lines.map((e) => e.kind)).toEqual(["repair", "event"]);
@@ -195,6 +205,7 @@ describe("hull condition and event results on screen (Step 26.7, decisions 0.5.1
       at: NOW - 30_000 + i,
       pilotId: "p1",
       shipId: "s1",
+      seen: false,
       kind: "flight",
       dispatchId: `d${i}`,
       deadhead: false,
@@ -222,6 +233,7 @@ describe("hull condition and event results on screen (Step 26.7, decisions 0.5.1
           at: NOW - 50_000,
           pilotId: null,
           shipId: null,
+          seen: false,
           kind: "goal-ready",
           goalId: "first-own-delivery",
         },
@@ -232,6 +244,7 @@ describe("hull condition and event results on screen (Step 26.7, decisions 0.5.1
           at: NOW - 40_000,
           pilotId: "p1",
           shipId: "s1",
+          seen: false,
           kind: "level-up",
           level: 2,
           skillPoints: 1,
diff --git a/apps/web/test/logbook-screen.test.tsx b/apps/web/test/logbook-screen.test.tsx
index f7ce87f..090478d 100644
--- a/apps/web/test/logbook-screen.test.tsx
+++ b/apps/web/test/logbook-screen.test.tsx
@@ -41,6 +41,7 @@ const job = (pilotId: string, hoursAgo: number, over: Partial<LogEntry> = {}): L
     at: at(hoursAgo),
     pilotId,
     shipId: `s-${pilotId}`,
+    seen: false,
     kind: "flight",
     dispatchId: `d${n}`,
     deadhead: false,
@@ -72,12 +73,21 @@ const entries: LogEntry[] = [
     xp: 0,
     fuelCost: 40,
   }),
-  { id: "r1", at: at(2), pilotId: "ada", shipId: "s-ada", kind: "rest", until: restUntil },
+  {
+    id: "r1",
+    at: at(2),
+    pilotId: "ada",
+    shipId: "s-ada",
+    seen: false,
+    kind: "rest",
+    until: restUntil,
+  },
   {
     id: "f1",
     at: at(3),
     pilotId: "ada",
     shipId: "s-ada",
+    seen: false,
     kind: "refuel",
     locationId: "earth",
     boughtFu: 12,
@@ -89,16 +99,26 @@ const entries: LogEntry[] = [
     at: at(4),
     pilotId: "bo",
     shipId: "s-bo",
+    seen: false,
     kind: "upgrade",
     upgradeId: "engines",
     level: 2,
   },
-  { id: "x1", at: at(4), pilotId: "bo", shipId: "s-bo", kind: "discovery", locationId: "mars" },
+  {
+    id: "x1",
+    at: at(4),
+    pilotId: "bo",
+    shipId: "s-bo",
+    seen: false,
+    kind: "discovery",
+    locationId: "mars",
+  },
   {
     id: "l1",
     at: at(4),
     pilotId: "bo",
     shipId: "s-bo",
+    seen: false,
     kind: "level-up",
     level: 3,
     skillPoints: 1,
@@ -113,6 +133,7 @@ const entries: LogEntry[] = [
     at: at(1),
     pilotId: null,
     shipId: null,
+    seen: false,
     kind: "goal-ready",
     goalId: "first-own-delivery",
   },
diff --git a/apps/web/test/service.test.tsx b/apps/web/test/service.test.tsx
index f7b2607..08e7dee 100644
--- a/apps/web/test/service.test.tsx
+++ b/apps/web/test/service.test.tsx
@@ -232,6 +232,7 @@ describe("service in the Logbook and the away summary (Step 27.6)", () => {
     at: 1_000,
     pilotId: "p1",
     shipId: "s1",
+    seen: false,
     kind: "service",
     phase,
     hqId: "earth",
diff --git a/memory-bank/architecture.md b/memory-bank/architecture.md
index 0e24b48..9bfcae1 100644
--- a/memory-bank/architecture.md
+++ b/memory-bank/architecture.md
@@ -66,6 +66,7 @@ The `routes` catalog is the list of engine commands (CR-014). Each entry has `re
 | `acceptDeal` | `POST /api/deal/accept` | — | `PlayerState` | yes |
 | `setSleepThreshold` | `POST /api/fleet/sleep-after` | `hours` (one of `fleetSleep.optionsHours`, else `validation-error`) | `PlayerState` | yes; a manual decision (CR-024) |
 | `getLogbook` | `GET /api/logbook` | — | `{ entries, absence: { from, to }, lastAbsence, problems }` (CR-025: the last 7 days, the absence since the summary was last closed, the one before, and what needs the player now) | yes |
+| `markLogbookSeen` | `POST /api/logbook/seen` | `entryIds` | `{ marked }` (entries newly seen) | yes; not a manual decision; unknown ids ignored (CR-028) |
 | `answerRadioCall` | `POST /api/dispatches/:dispatchId/radio` | `dispatchId`, `optionId` | `{ radioCalls }` (still waiting) | yes; a manual decision; `radio-call-not-found` before it fires, `radio-call-closed` after its window or once applied, `radio-option-unavailable` (CR-026) |
 | `repairShip` | `POST /api/ships/:shipId/repair` | `shipId` | `{ ship }` (in the shop) | yes; a manual decision; at an HQ, below 100% (`hull-intact`), charged now (CR-026) |
 | `bookService` | `POST /api/ships/:shipId/service` | `shipId`, `repair`, `upgradeId` (or null), `hqId` (optional: the nearest reachable HQ) | `{ ship }` (with its `booking`) | yes; a manual decision; replaces an unstarted booking; starts at once if idle at the HQ; `nothing-to-service`, `hull-intact`, `upgrade-maxed`, `unknown-hq`, `no-hq-reachable`, `service-started` (CR-027) |
@@ -89,7 +90,7 @@ The `routes` catalog is the list of engine commands (CR-014). Each entry has `re
 
 ## Save document (`packages/schema/src/save.ts`, CR-014)
 
-One document per company on the device, validated on every load and save: `saveVersion` (currently 12; 1 → 2 added fuel tanks, CR-015; 2 → 3 put every ship on Manual refueling, CR-018; 3 → 4 dropped stored boards, CR-019; 4 → 5 added pilot `mode` and `orders` and the company's `dispatchOffice` and `npcSpendingFloor`, CR-021; 5 → 6 added pilot `nextDecisionAt` and `emptyPeriods` and dispatch `independent`, CR-021; 6 → 7 added `player.welcomeSeen`, true for existing companies, CR-022; 7 → 8 added ship `shopPilotId`, null for existing ships, CR-023; 8 → 9 added company `lastManualDecisionAt` (null until the engine's first catch-up sets it) and `sleepAfterHours`, CR-024; 9 → 10 added the `logbook`, player `awaySince`, `lastAbsence` and `readyGoalsLogged`, and ship `shopOpen`, turning resolved dispatches into entries, CR-025; 10 → 11 added ship `hullConditionPct` (100), `quietTrips` and `shopRepair`, dispatch `event` and `eventApplied` (null), company `firstEventDone` and `tripsSinceDeal`, CR-026; 11 → 12 added ship `booking` (null) and `autoRepair` (on, 40%), CR-027), `saveId`, `lastTimeSeen` (the clock never goes below it), `player` (world seed, tutorial state, deal accepted), `company` (name, credits, loan, the Dispatch Office and spending floor, and since CR-024 the last manual decision and the sleep threshold), `ships` (with `upgrades` as a level map, shop fields including `shopPilotId` (the pilot waiting out the shop as rest, CR-023), and `fuelFu`, `fuelAvgPrice`, `refuelPolicy` since CR-015), `pilots`, `bays`, `discoveredLocations`, `contractBoards` (stored boards), `dispatches` (sim record, status, resolution, acknowledged), `acceptedContracts`, `claimedGoals`, `logbook` (CR-025: entries of kind `flight` (deliveries and deadheads, with payout, pilot pay, fuel used, loan repayment and XP), `refuel` (top-up, bought, pilot or emergency), `rest`, `upgrade`, `discovery`, `level-up` and `goal-ready`, each with time, pilot and ship; ids made from what they record; kept `logbookRetentionRealDays` (7) and pruned on save). Written by `packages/engine/src/game/logbook.ts` helpers from arrivals, refuelling, rest, shop ends (a catch-up event for every `shopOpen` ship), and goals becoming ready (after every catch-up event and command). It mirrors the old server's database tables without player ids; the stored contract, dispatch record and resolution are type-checked against the sim types. `migrateSave(raw)` steps an older save through `SAVE_MIGRATIONS` (`applyMigrations`) and validates it, returning a readable error instead of throwing.
+One document per company on the device, validated on every load and save: `saveVersion` (currently 13; 1 → 2 added fuel tanks, CR-015; 2 → 3 put every ship on Manual refueling, CR-018; 3 → 4 dropped stored boards, CR-019; 4 → 5 added pilot `mode` and `orders` and the company's `dispatchOffice` and `npcSpendingFloor`, CR-021; 5 → 6 added pilot `nextDecisionAt` and `emptyPeriods` and dispatch `independent`, CR-021; 6 → 7 added `player.welcomeSeen`, true for existing companies, CR-022; 7 → 8 added ship `shopPilotId`, null for existing ships, CR-023; 8 → 9 added company `lastManualDecisionAt` (null until the engine's first catch-up sets it) and `sleepAfterHours`, CR-024; 9 → 10 added the `logbook`, player `awaySince`, `lastAbsence` and `readyGoalsLogged`, and ship `shopOpen`, turning resolved dispatches into entries, CR-025; 10 → 11 added ship `hullConditionPct` (100), `quietTrips` and `shopRepair`, dispatch `event` and `eventApplied` (null), company `firstEventDone` and `tripsSinceDeal`, CR-026; 11 → 12 added ship `booking` (null) and `autoRepair` (on, 40%), CR-027; 12 → 13 added logbook entries' `seen`, true for existing entries, CR-028), `saveId`, `lastTimeSeen` (the clock never goes below it), `player` (world seed, tutorial state, deal accepted), `company` (name, credits, loan, the Dispatch Office and spending floor, and since CR-024 the last manual decision and the sleep threshold), `ships` (with `upgrades` as a level map, shop fields including `shopPilotId` (the pilot waiting out the shop as rest, CR-023), and `fuelFu`, `fuelAvgPrice`, `refuelPolicy` since CR-015), `pilots`, `bays`, `discoveredLocations`, `contractBoards` (stored boards), `dispatches` (sim record, status, resolution, acknowledged), `acceptedContracts`, `claimedGoals`, `logbook` (CR-025: entries of kind `flight` (deliveries and deadheads, with payout, pilot pay, fuel used, loan repayment and XP), `refuel` (top-up, bought, pilot or emergency), `rest`, `upgrade`, `discovery`, `level-up` and `goal-ready`, each with time, pilot and ship; ids made from what they record; kept `logbookRetentionRealDays` (7) and pruned on save). Written by `packages/engine/src/game/logbook.ts` helpers from arrivals, refuelling, rest, shop ends (a catch-up event for every `shopOpen` ship), and goals becoming ready (after every catch-up event and command). It mirrors the old server's database tables without player ids; the stored contract, dispatch record and resolution are type-checked against the sim types. `migrateSave(raw)` steps an older save through `SAVE_MIGRATIONS` (`applyMigrations`) and validates it, returning a readable error instead of throwing.
 
 Commands (`packages/engine/src/game/`): `GameEngine.call(name, input)` runs the route catalog's endpoints on the save, with the same schemas and error codes (`CommandError`); `getPlayerState` with no save answers `unauthorized`. Every command resolves due arrivals first and prunes on save; saves are skipped when nothing changed. `stats` keeps lifetime delivery counts for goals, so seen trips older than `savedDispatchRetentionRealHours` can be pruned.
 
diff --git a/memory-bank/progress.md b/memory-bank/progress.md
index 5379aea..fdda0ae 100644
--- a/memory-bank/progress.md
+++ b/memory-bank/progress.md
@@ -581,7 +581,7 @@ Spec: `memory-bank/change-requests/CR-027-service-bookings.md` (received as "CR-
 
 Spec: `memory-bank/change-requests/CR-028-live-toasts.md` (received as "CR-026 … Phase 26"). New decisions recorded as plan §0.5.160–0.5.163.
 
-- [ ] Step 28.1 — Engine: seen tracking
+- [x] **Step 28.1 — Engine: seen tracking.** Every logbook entry has a saved `seen` flag (schema, and the sim's `LogbookEntry`); `logEntry` writes new entries unseen. Command `markLogbookSeen` (`POST /api/logbook/seen`, `{ entryIds }` → `{ marked }`), not a manual decision, so it doesn't wake the fleet. Save version 13: the 12 → 13 migration marks every existing entry seen. Tests: `packages/engine/test/logbook.test.ts` (new entries unseen; marking one, unknown ids ignored, marking again changes nothing, the fleet not woken, kept through export and import); `packages/schema/test/save.test.ts` (12 → 13); the route catalog.
 - [ ] Step 28.2 — Client: presence tracking
 - [ ] Step 28.3 — Client: toasts
 - [ ] Step 28.4 — Client: pop-up only after being away
diff --git a/packages/engine/src/game/commands.ts b/packages/engine/src/game/commands.ts
index 3e3dd68..5a9c596 100644
--- a/packages/engine/src/game/commands.ts
+++ b/packages/engine/src/game/commands.ts
@@ -31,6 +31,7 @@ import {
 } from "./state";
 import { buyDispatchOffice, setPilotMode, setPilotOrders, setSpendingFloor } from "./independent";
 import { autoRepairAfterDamage, bookService, cancelBooking, setAutoRepair } from "./service";
+import { markSeen } from "./logbook";
 
 /** Every command that works on an existing company's save (the server's endpoints). */
 export function commandTable(): CommandTable {
@@ -99,6 +100,8 @@ export function commandTable(): CommandTable {
       repairShip(save, input, now);
       return { ship: toApiShip(save, requireShip(save, input.shipId), now) };
     },
+    // Toasted or shown in the pop-up (decision 0.5.163).
+    markLogbookSeen: ({ save }, input) => ({ marked: markSeen(save, input.entryIds) }),
     // The logbook and the absence (decisions 0.5.140, 0.5.141).
     getLogbook: ({ save, now }) => ({
       entries: save.logbook,
diff --git a/packages/engine/src/game/logbook.ts b/packages/engine/src/game/logbook.ts
index 7c7b130..6ed0482 100644
--- a/packages/engine/src/game/logbook.ts
+++ b/packages/engine/src/game/logbook.ts
@@ -5,7 +5,11 @@ import { goalStates } from "./state";
 
 const DAY_MS = 24 * 60 * 60 * 1000;
 
-type NewEntry = LogEntry extends infer E ? (E extends LogEntry ? Omit<E, "id"> : never) : never;
+type NewEntry = LogEntry extends infer E
+  ? E extends LogEntry
+    ? Omit<E, "id" | "seen">
+    : never
+  : never;
 
 /**
  * Adds an entry to the logbook (decision 0.5.141). Its id is `base`, made from
@@ -15,7 +19,21 @@ type NewEntry = LogEntry extends infer E ? (E extends LogEntry ? Omit<E, "id"> :
 export function logEntry(save: SaveDocument, base: string, entry: NewEntry): void {
   let id = base;
   for (let n = 2; save.logbook.some((e) => e.id === id); n++) id = `${base}#${n}`;
-  save.logbook.push({ id, ...entry } as LogEntry);
+  // Unseen until the player is shown it (decision 0.5.163).
+  save.logbook.push({ id, ...entry, seen: false } as LogEntry);
+}
+
+/** Marks entries seen (decision 0.5.163); returns how many weren't before. */
+export function markSeen(save: SaveDocument, entryIds: readonly string[]): number {
+  const ids = new Set(entryIds);
+  let marked = 0;
+  for (const entry of save.logbook) {
+    if (ids.has(entry.id) && !entry.seen) {
+      entry.seen = true;
+      marked++;
+    }
+  }
+  return marked;
 }
 
 /** The pilot assigned to a ship, if any: whose entry a ship's event is. */
diff --git a/packages/engine/test/logbook.test.ts b/packages/engine/test/logbook.test.ts
index 1c9ac02..e35d045 100644
--- a/packages/engine/test/logbook.test.ts
+++ b/packages/engine/test/logbook.test.ts
@@ -322,3 +322,35 @@ describe("getLogbook and what needs the player (Step 25.3, decision 0.5.140)", (
     expect((await test.app.call("getLogbook", {})).problems).toEqual([]);
   });
 });
+
+describe("seen entries (Step 28.1, decision 0.5.163)", () => {
+  it("starts new entries unseen, marks them seen, and keeps that through a reload", async () => {
+    const test = newTestApp();
+    const o = await owner(test);
+    const { dispatch, save } = await deliver(test, o.avatarId, o.shipId);
+    const flightId = `${dispatch.id}:flight`;
+    expect(save.logbook.length).toBeGreaterThan(0);
+    expect(save.logbook.every((e) => !e.seen)).toBe(true);
+
+    const decidedAt = save.company.lastManualDecisionAt;
+    test.clock.now += 60_000;
+    expect(
+      await test.app.call("markLogbookSeen", { entryIds: [flightId, "no-such-entry"] }),
+    ).toEqual({ marked: 1 });
+    // Again: nothing new to mark.
+    expect(await test.app.call("markLogbookSeen", { entryIds: [flightId] })).toEqual({ marked: 0 });
+    const after = await readSave(test.app);
+    expect(after.logbook.find((e) => e.id === flightId)!.seen).toBe(true);
+    expect(after.logbook.filter((e) => e.id !== flightId).every((e) => !e.seen)).toBe(true);
+    // Seeing a toast isn't a decision: it doesn't wake the fleet (CR-024).
+    expect(after.company.lastManualDecisionAt).toBe(decidedAt);
+
+    // A reload (the save exported and opened again) keeps it.
+    const { code } = await test.app.call("exportSave", {});
+    const reloaded = newTestApp();
+    reloaded.clock.now = test.clock.now;
+    await reloaded.app.call("importSave", { code });
+    const book = await reloaded.app.call("getLogbook", {});
+    expect(book.entries.find((e) => e.id === flightId)!.seen).toBe(true);
+  });
+});
diff --git a/packages/schema/src/logbook.ts b/packages/schema/src/logbook.ts
index 4e2f011..598eea5 100644
--- a/packages/schema/src/logbook.ts
+++ b/packages/schema/src/logbook.ts
@@ -15,6 +15,8 @@ const base = {
   /** Whose entry it is: the flight's pilot, the ship's pilot, or none. */
   pilotId: idSchema.nullable(),
   shipId: idSchema.nullable(),
+  /** Shown to the player, as a toast or in the pop-up (decision 0.5.163). */
+  seen: z.boolean(),
 };
 
 export const logEntrySchema = z.discriminatedUnion("kind", [
diff --git a/packages/schema/src/requests.ts b/packages/schema/src/requests.ts
index 3fb2a30..ca02fc1 100644
--- a/packages/schema/src/requests.ts
+++ b/packages/schema/src/requests.ts
@@ -87,6 +87,14 @@ export const pilotOrdersRequestSchema = z.object({ pilotId: idSchema, orders: pi
 /** Answer a radio call on a trip (decision 0.5.144). */
 export const answerRadioCallRequestSchema = z.object({ dispatchId: idSchema, optionId: idSchema });
 export const radioCallsResponseSchema = z.object({ radioCalls: z.array(radioCallSchema) });
+/** Marks logbook entries seen (decision 0.5.163): toasted, or shown in the pop-up. */
+export const markLogbookSeenRequestSchema = z.object({
+  entryIds: z.array(z.string().min(1)).max(1000),
+});
+export const markLogbookSeenResponseSchema = z.object({
+  /** Entries newly marked seen. */
+  marked: z.number().int().nonnegative(),
+});
 /** Book (or change) service for a ship (decision 0.5.153); no HQ means the nearest reachable. */
 export const bookServiceRequestSchema = z.object({
   shipId: idSchema,
diff --git a/packages/schema/src/routes.ts b/packages/schema/src/routes.ts
index 325bbe8..43217a5 100644
--- a/packages/schema/src/routes.ts
+++ b/packages/schema/src/routes.ts
@@ -6,6 +6,8 @@ import {
   answerRadioCallRequestSchema,
   autoRepairRequestSchema,
   bookServiceRequestSchema,
+  markLogbookSeenRequestSchema,
+  markLogbookSeenResponseSchema,
   radioCallsResponseSchema,
   repairShipRequestSchema,
   acknowledgeSummariesResponseSchema,
@@ -264,6 +266,15 @@ export const routes = {
     auth: true,
     manualDecision: true,
   },
+  markLogbookSeen: {
+    method: "POST",
+    path: "/api/logbook/seen",
+    request: markLogbookSeenRequestSchema,
+    response: markLogbookSeenResponseSchema,
+    auth: true,
+    // Seeing a toast or the pop-up isn't a decision (CR-028 Step 28.1).
+    manualDecision: false,
+  },
   bookService: {
     method: "POST",
     path: "/api/ships/:shipId/service",
diff --git a/packages/schema/src/save.ts b/packages/schema/src/save.ts
index 142ac39..a4b5d8f 100644
--- a/packages/schema/src/save.ts
+++ b/packages/schema/src/save.ts
@@ -207,7 +207,7 @@ export const savedDispatchSchema = z.object({
 });
 
 /** The save version this build writes. Bump it with a new migration. */
-export const CURRENT_SAVE_VERSION = 12;
+export const CURRENT_SAVE_VERSION = 13;
 
 export const saveDocumentSchema = z.object({
   saveVersion: z.literal(CURRENT_SAVE_VERSION),
@@ -553,6 +553,11 @@ function serviceBookings(save: Doc): Doc {
   };
 }
 
+/** Version 12 → 13 (CR-028 Step 28.1): every logbook entry already there counts as seen. */
+function seenEntries(save: Doc): Doc {
+  return { ...save, logbook: records(save.logbook).map((entry) => ({ ...entry, seen: true })) };
+}
+
 export const SAVE_MIGRATIONS: readonly SaveMigration[] = [
   { from: 1, migrate: addFuelTanks },
   { from: 2, migrate: manualRefueling },
@@ -565,6 +570,7 @@ export const SAVE_MIGRATIONS: readonly SaveMigration[] = [
   { from: 9, migrate: logbook },
   { from: 10, migrate: tripEvents },
   { from: 11, migrate: serviceBookings },
+  { from: 12, migrate: seenEntries },
 ];
 
 export type SaveParse = { ok: true; save: SaveDocument } | { ok: false; error: string };
diff --git a/packages/schema/test/routes.test.ts b/packages/schema/test/routes.test.ts
index df7d2d4..744d590 100644
--- a/packages/schema/test/routes.test.ts
+++ b/packages/schema/test/routes.test.ts
@@ -14,6 +14,7 @@ describe("route catalog", () => {
         "getContractBoard",
         "getTutorialBoard",
         "getLogbook",
+        "markLogbookSeen",
         "answerRadioCall",
         "repairShip",
         "bookService",
diff --git a/packages/schema/test/save-fixture.ts b/packages/schema/test/save-fixture.ts
index 920976d..1dbe5f3 100644
--- a/packages/schema/test/save-fixture.ts
+++ b/packages/schema/test/save-fixture.ts
@@ -45,7 +45,7 @@ export function fullSave(): SaveDocument {
     seed: 42,
   });
   return {
-    saveVersion: 12,
+    saveVersion: 13,
     saveId: "save-1",
     lastTimeSeen: T + 3_600_000,
     player: {
@@ -271,6 +271,7 @@ export function fullSave(): SaveDocument {
         loanRepayment: 340,
         xp: 10,
         scriptedId: null,
+        seen: true,
       },
       {
         id: "d0:top-up",
@@ -282,6 +283,7 @@ export function fullSave(): SaveDocument {
         boughtFu: 7.6,
         cost: 84,
         source: "top-up",
+        seen: true,
       },
     ],
   };
diff --git a/packages/schema/test/save.test.ts b/packages/schema/test/save.test.ts
index c14b5ae..4005a2b 100644
--- a/packages/schema/test/save.test.ts
+++ b/packages/schema/test/save.test.ts
@@ -11,7 +11,7 @@ import { fullSave } from "./save-fixture";
 describe("save document (Step 14.2)", () => {
   it("validates a fully populated save", () => {
     expect(saveDocumentSchema.safeParse(fullSave()).success).toBe(true);
-    expect(CURRENT_SAVE_VERSION).toBe(12);
+    expect(CURRENT_SAVE_VERSION).toBe(13);
   });
 
   it("rejects an invalid save with a readable error naming the field", () => {
@@ -84,7 +84,7 @@ describe("save migration 1 → 2: fuel tanks (CR-015 §5)", () => {
     if (!result.ok) throw new Error(result.error);
     const { save } = result;
     const before = fullSave();
-    expect(save.saveVersion).toBe(12);
+    expect(save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     // The Courier has Extended Fuel Tanks 1 (40 fu × 4.8) and is in flight: the base
     // price, 5 cr/fu since CR-018 (decision 0.5.110).
     expect(save.ships[0]).toMatchObject({ fuelFu: 192, fuelAvgPrice: 5, refuelPolicy: "manual" });
@@ -116,7 +116,7 @@ describe("save migration 2 → 3: Manual refueling (CR-018 §3)", () => {
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
     const { save } = result;
-    expect(save.saveVersion).toBe(12);
+    expect(save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     expect(save.ships.map((s) => s.refuelPolicy)).toEqual(save.ships.map(() => "manual"));
     expect(save.ships.map((s) => [s.fuelFu, s.fuelAvgPrice])).toEqual(
       before.ships.map((s) => [s.fuelFu, s.fuelAvgPrice]),
@@ -142,7 +142,7 @@ describe("save migration 3 → 4: completable boards (CR-019 §3)", () => {
     for (const board of old.contractBoards) delete board.fleet;
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
-    expect(result.save.saveVersion).toBe(12);
+    expect(result.save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     expect(result.save.contractBoards).toEqual([]);
     expect({ ...result.save, contractBoards: [] }).toEqual({ ...before, contractBoards: [] });
   });
@@ -164,7 +164,7 @@ describe("save migration 4 → 5: independent pilots (CR-021 §3)", () => {
     }
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
-    expect(result.save.saveVersion).toBe(12);
+    expect(result.save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     expect(result.save.company).toMatchObject({ dispatchOffice: false, npcSpendingFloor: 500 });
     for (const pilot of result.save.pilots) {
       expect(pilot.mode).toBe("manual");
@@ -191,7 +191,7 @@ describe("save migration 6 → 7: welcome cards (CR-022 §3)", () => {
     delete old.player.welcomeSeen;
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
-    expect(result.save.saveVersion).toBe(12);
+    expect(result.save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     expect(result.save.player.welcomeSeen).toBe(true);
     expect(result.save).toEqual(before);
   });
@@ -207,7 +207,7 @@ describe("save migration 7 → 8: shop time counts as rest (CR-023)", () => {
     for (const ship of old.ships) delete ship.shopPilotId;
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
-    expect(result.save.saveVersion).toBe(12);
+    expect(result.save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     // Including the ship still in the shop: its upgrade finishes without the rest.
     expect(result.save.ships.map((s) => s.shopPilotId)).toEqual(before.ships.map(() => null));
     expect(result.save).toEqual(before);
@@ -225,7 +225,7 @@ describe("save migration 8 → 9: fleet sleep (CR-024 §3)", () => {
     delete old.company.sleepAfterHours;
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
-    expect(result.save.saveVersion).toBe(12);
+    expect(result.save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     expect(result.save.company.lastManualDecisionAt).toBeNull();
     expect(result.save.company.sleepAfterHours).toBe(24);
     expect(result.save).toEqual(before);
@@ -245,7 +245,7 @@ describe("save migration 9 → 10: the logbook (CR-025 §4)", () => {
     for (const ship of old.ships) delete ship.shopOpen;
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
-    expect(result.save.saveVersion).toBe(12);
+    expect(result.save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     // The resolved d0: its flight (payout = credits + pilot pay + loan) and its top-up.
     expect(result.save.logbook.map((e) => e.id)).toEqual(["d0:flight", "d0:top-up"]);
     expect(result.save.ships.map((s) => s.shopOpen)).toEqual([false, true]);
@@ -285,7 +285,7 @@ describe("save migration 10 → 11: events and hulls (CR-026 §6)", () => {
     }
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
-    expect(result.save.saveVersion).toBe(12);
+    expect(result.save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     expect(result.save.ships.map((s) => s.hullConditionPct)).toEqual([100, 100]);
     expect(result.save.dispatches.map((d) => d.event)).toEqual([null, null]);
     // The deal is made, so the grace trips are behind it.
@@ -307,7 +307,7 @@ describe("save migration 11 → 12: service bookings (CR-027 §5)", () => {
     }
     const result = migrateSave(old);
     if (!result.ok) throw new Error(result.error);
-    expect(result.save.saveVersion).toBe(12);
+    expect(result.save.saveVersion).toBe(CURRENT_SAVE_VERSION);
     expect(result.save.ships.map((s) => [s.booking, s.autoRepair])).toEqual([
       [null, { on: true, thresholdPct: 40 }],
       [null, { on: true, thresholdPct: 40 }],
@@ -315,3 +315,19 @@ describe("save migration 11 → 12: service bookings (CR-027 §5)", () => {
     expect(result.save).toEqual(before);
   });
 });
+
+describe("save migration 12 → 13: seen entries (CR-028 Step 28.1)", () => {
+  it("marks every logbook entry already there as seen, and changes nothing else", () => {
+    const before = fullSave();
+    const old = JSON.parse(JSON.stringify(before)) as Record<string, unknown> & {
+      logbook: Record<string, unknown>[];
+    };
+    old.saveVersion = 12;
+    for (const entry of old.logbook) delete entry.seen;
+    const result = migrateSave(old);
+    if (!result.ok) throw new Error(result.error);
+    expect(result.save.saveVersion).toBe(13);
+    expect(result.save.logbook.map((e) => e.seen)).toEqual([true, true]);
+    expect(result.save).toEqual(before);
+  });
+});
diff --git a/packages/sim/src/away.ts b/packages/sim/src/away.ts
index d42916d..e3b7133 100644
--- a/packages/sim/src/away.ts
+++ b/packages/sim/src/away.ts
@@ -9,6 +9,8 @@ interface EntryBase {
   at: RealTime;
   pilotId: string | null;
   shipId: string | null;
+  /** Shown to the player, as a toast or in the pop-up (decision 0.5.163); new entries start unseen. */
+  seen: boolean;
 }
 
 export type LogbookEntry = EntryBase &