diff --git a/tests/e2e/p1-urls-nav.spec.ts b/tests/e2e/p1-urls-nav.spec.ts
new file mode 100644
index 00000000..783a2b23
--- /dev/null
+++ b/tests/e2e/p1-urls-nav.spec.ts
@@ -0,0 +1,260 @@
+/**
+ * P1 e2e coverage: URL guards, breadcrumbs, and cross-section navigation.
+ *
+ * TZ references:
+ *   4.1.2-R11 — out-of-range dates redirect to section start page
+ *   4.1.2-R10 — unknown URL renders 404
+ *   Table 7   — breadcrumb structure per page tier
+ *   Table 10  — cross-section filter carry-over Board ↔ Schedule
+ *   §4.1.1 ¶12 — Flight-Map filter is independent (no cross-section carry-over)
+ */
+
+import { test, expect } from "@playwright/test";
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+/** Format a Date as yyyymmdd (no separators). */
+function fmt(d: Date): string {
+  return `${d.getFullYear()}${String(d.getMonth() + 1).padStart(2, "0")}${String(d.getDate()).padStart(2, "0")}`;
+}
+
+/** Return a date that is `n` days offset from today. */
+function daysFromNow(n: number): Date {
+  const d = new Date();
+  d.setDate(d.getDate() + n);
+  return d;
+}
+
+// ---------------------------------------------------------------------------
+// 4.1.2-R11: Out-of-range date redirects to section start page
+// ---------------------------------------------------------------------------
+
+test.describe("P1 — 4.1.2-R11: out-of-range dates redirect to start page", () => {
+  test("Online-Board flight URL with date +30 days (beyond +14 window) redirects to /onlineboard", async ({
+    page,
+  }) => {
+    const far = fmt(daysFromNow(30));
+    await page.goto(`/ru/onlineboard/flight/SU1234-${far}`);
+    await page.waitForLoadState("domcontentloaded");
+    // Must land on the start page (not the search page).
+    // The server normalises /ru → /ru-ru, so accept both locale forms.
+    await expect(page).toHaveURL(/\/ru(-ru)?\/onlineboard(\?.*)?$/, { timeout: 10000 });
+    await expect(page.locator('[data-testid="online-board-start"]')).toBeVisible({
+      timeout: 10000,
+    });
+  });
+
+  test("Online-Board route URL with date -5 days (before -1 window) redirects to /onlineboard", async ({
+    page,
+  }) => {
+    const past = fmt(daysFromNow(-5));
+    await page.goto(`/ru/onlineboard/route/MOW-LED-${past}`);
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page).toHaveURL(/\/ru(-ru)?\/onlineboard(\?.*)?$/, { timeout: 10000 });
+    await expect(page.locator('[data-testid="online-board-start"]')).toBeVisible({
+      timeout: 10000,
+    });
+  });
+
+  test("Schedule route URL with date +400 days (beyond +330 window) redirects to /schedule", async ({
+    page,
+  }) => {
+    const farFrom = fmt(daysFromNow(400));
+    const farTo = fmt(daysFromNow(407));
+    await page.goto(`/ru/schedule/route/MOW-LED-${farFrom}-${farTo}`);
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page).toHaveURL(/\/ru(-ru)?\/schedule(\?.*)?$/, { timeout: 10000 });
+    await expect(page.locator('[data-testid="schedule-start"]')).toBeVisible({
+      timeout: 10000,
+    });
+  });
+});
+
+// ---------------------------------------------------------------------------
+// 4.1.2-R10: Unknown URL → 404
+// ---------------------------------------------------------------------------
+
+test.describe("P1 — 4.1.2-R10: unknown URL shows 404", () => {
+  test("/ru/nonexistent does not crash — shows error or empty body", async ({
+    page,
+  }) => {
+    // Matches the existing pattern in navigation.spec.ts: the app handles
+    // unknown routes gracefully (404 page or redirect, not a JS crash).
+    await page.goto("/ru/nonexistent");
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page.locator("body")).not.toBeEmpty();
+  });
+
+  test("/error/404 renders 404 content (client-side navigation)", async ({
+    page,
+  }) => {
+    // Direct URL navigate to the error route produces blank SSR output;
+    // client-side assign is the established pattern (see navigation.spec.ts).
+    await page.goto("/ru/onlineboard");
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page.locator('[data-testid="online-board-start"]')).toBeVisible({
+      timeout: 10000,
+    });
+
+    await page.evaluate(() => window.location.assign("/error/404"));
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page.locator(".error-page__code")).toHaveText("404", {
+      timeout: 10000,
+    });
+  });
+});
+
+// ---------------------------------------------------------------------------
+// Table 7: Breadcrumbs — start pages show Home only (1 item)
+// ---------------------------------------------------------------------------
+
+test.describe("P1 — Table 7: breadcrumbs on start pages (Home only)", () => {
+  test("Online-Board start page has exactly 1 breadcrumb (Home)", async ({
+    page,
+  }) => {
+    await page.goto("/ru/onlineboard");
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page.locator('[data-testid="online-board-start"]')).toBeVisible({
+      timeout: 10000,
+    });
+
+    const crumbs = page.locator('[data-testid="breadcrumbs"] li');
+    await expect(crumbs).toHaveCount(1);
+  });
+
+  test("Schedule start page has exactly 1 breadcrumb (Home)", async ({
+    page,
+  }) => {
+    await page.goto("/ru/schedule");
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page.locator('[data-testid="schedule-start"]')).toBeVisible({
+      timeout: 10000,
+    });
+
+    const crumbs = page.locator('[data-testid="breadcrumbs"] li');
+    await expect(crumbs).toHaveCount(1);
+  });
+
+  test("Flight-Map start page has exactly 1 breadcrumb (Home)", async ({
+    page,
+  }) => {
+    await page.goto("/ru/flights-map");
+    await page.waitForLoadState("domcontentloaded");
+
+    // Feature flag may disable the map; either state is acceptable for
+    // this breadcrumb test — the breadcrumb renders in both cases.
+    const mapStart = page.locator('[data-testid="flights-map-start"]');
+    const mapDisabled = page.locator('[data-testid="flights-map-disabled"]');
+    await expect(mapStart.or(mapDisabled)).toBeVisible({ timeout: 10000 });
+
+    const crumbs = page.locator('[data-testid="breadcrumbs"] li');
+    await expect(crumbs).toHaveCount(1);
+  });
+});
+
+// ---------------------------------------------------------------------------
+// Table 7: Breadcrumbs — search pages show Home + Section (2 items)
+//   Online-Board search: [Home, "Онлайн-Табло"]
+//   Schedule search: [Home, "Расписание", <route heading>] → 3 items
+// ---------------------------------------------------------------------------
+
+test.describe("P1 — Table 7: breadcrumbs on search pages", () => {
+  test("Online-Board route search page has 2 breadcrumbs (Home + Section)", async ({
+    page,
+  }) => {
+    // Use an in-window date so the guard lets the page through.
+    const today = fmt(new Date());
+    await page.goto(`/ru/onlineboard/route/MOW-LED-${today}`);
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page.locator("body")).not.toBeEmpty();
+
+    // Wait for the breadcrumbs to hydrate (lazy load means SSR crumbs may not
+    // be present immediately).
+    const crumbs = page.locator('[data-testid="breadcrumbs"] li');
+    await expect(crumbs).toHaveCount(2, { timeout: 10000 });
+  });
+
+  test("Online-Board flight search page has 2 breadcrumbs (Home + Section)", async ({
+    page,
+  }) => {
+    const today = fmt(new Date());
+    await page.goto(`/ru/onlineboard/flight/SU0100-${today}`);
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page.locator("body")).not.toBeEmpty();
+
+    const crumbs = page.locator('[data-testid="breadcrumbs"] li');
+    await expect(crumbs).toHaveCount(2, { timeout: 10000 });
+  });
+
+  test("Schedule route search page has 3 breadcrumbs (Home + Section + Route heading)", async ({
+    page,
+  }) => {
+    const today = fmt(new Date());
+    const weekAhead = fmt(daysFromNow(7));
+    await page.goto(`/ru/schedule/route/MOW-LED-${today}-${weekAhead}`);
+    await page.waitForLoadState("domcontentloaded");
+    await expect(page.locator("body")).not.toBeEmpty();
+
+    const crumbs = page.locator('[data-testid="breadcrumbs"] li');
+    await expect(crumbs).toHaveCount(3, { timeout: 10000 });
+  });
+});
+
+// ---------------------------------------------------------------------------
+// Cross-section filter carry-over — TZ Table 10
+// Requires city-picker interaction and live API; skipped with TODO markers.
+// ---------------------------------------------------------------------------
+
+test.describe("P1 — Table 10: cross-section filter carry-over Board ↔ Schedule", () => {
+  // TODO: These tests require filling the city-picker (autocomplete with live
+  // API) and submitting a search to write the cross-section store. The store
+  // state is then read when navigating to the other section. This is too
+  // fiddly to implement reliably without network stubs / API availability
+  // guarantees in CI. Re-enable when a mock API or recorded fixture is in place.
+
+  test.fixme(
+    "navigating from Online-Board results to Schedule preserves departure/arrival cities",
+    async ({ page }) => {
+      // 1. Search on Online-Board (route tab) → MOW-LED.
+      // 2. Navigate to /ru/schedule.
+      // 3. Schedule start page filter should be pre-filled with MOW/LED via
+      //    the cross-section store (crossSectionNavigation.ts).
+      // Skipped: needs city-picker interaction + live API for autocomplete.
+      void page;
+    },
+  );
+
+  test.fixme(
+    "navigating from Schedule results to Online-Board preserves departure/arrival cities",
+    async ({ page }) => {
+      // 1. Search on Schedule (route tab) → MOW-LED.
+      // 2. Navigate to /ru/onlineboard.
+      // 3. Online-Board start page filter should be pre-filled with MOW/LED.
+      // Skipped: needs city-picker interaction + live API for autocomplete.
+      void page;
+    },
+  );
+});
+
+// ---------------------------------------------------------------------------
+// Flight-Map filter independence — TZ §4.1.1 ¶12
+// Requires city-picker interaction; skipped with TODO markers.
+// ---------------------------------------------------------------------------
+
+test.describe("P1 — §4.1.1 ¶12: Flight-Map filter is independent (no carry-over)", () => {
+  // TODO: Verify that searching on Online-Board does NOT pre-fill the
+  // Flight-Map filter, and vice-versa. Requires live city-picker + submit.
+  // Re-enable when network stubs are available.
+
+  test.fixme(
+    "Online-Board search does not affect Flight-Map departure city",
+    async ({ page }) => {
+      // 1. Search on Online-Board → MOW-LED.
+      // 2. Navigate to /ru/flights-map.
+      // 3. Flight-Map departure input should NOT show MOW (store is separate).
+      void page;
+    },
+  );
+});