diff --git a/web/src/map/follow.ts b/web/src/map/follow.ts
new file mode 100644
index 0000000..f39a024
--- /dev/null
+++ b/web/src/map/follow.ts
@@ -0,0 +1,43 @@
+/*
+ * follow.ts — the following/free camera controller (UI-SPEC §Follow / Recenter Control).
+ * --------------------------------------------------------------------------------------
+ * The camera pads 96px (12 × space-sm) so the position marker never hides
+ * under the strip or the recenter control. Recenter is a 400ms flyTo (the
+ * MapLibre viewport behavior, permitted; duration ≤ 400ms per UI-SPEC
+ * Micro-Behaviors). A USER gesture (movestart carrying originalEvent) flips
+ * to free — a programmatic move never does (T-03-16: the fix update must
+ * never read as the user having panned).
+ */
+import type { Map as MapLibreMap } from "maplibre-gl";
+import type { Fix } from "../location/types.ts";
+
+export const CAMERA_PADDING_PX = 96; // 12 x space-sm — marker never hides under strip or controls
+export const RECENTER_DURATION_MS = 400;
+
+export type FollowMode = "following" | "free";
+
+export function createFollowController(map: MapLibreMap, onModeChange: (m: FollowMode) => void) {
+  let mode: FollowMode = "following";
+  let lock = false;
+  const set = (m: FollowMode): void => {
+    if (m !== mode) {
+      mode = m;
+      onModeChange(m);
+    }
+  };
+  map.on("movestart", (e: { originalEvent?: unknown }) => {
+    if (lock) return;
+    if (e.originalEvent) set("free"); // a user gesture only, never a programmatic move
+  });
+  return {
+    get mode(): FollowMode {
+      return mode;
+    },
+    follow(fix: Fix): void {
+      lock = true;
+      map.flyTo({ center: [fix.lng, fix.lat], padding: CAMERA_PADDING_PX, duration: RECENTER_DURATION_MS });
+      set("following");
+      lock = false;
+    },
+  };
+}
diff --git a/web/src/map/map.ts b/web/src/map/map.ts
new file mode 100644
index 0000000..07b6741
--- /dev/null
+++ b/web/src/map/map.ts
@@ -0,0 +1,49 @@
+/*
+ * map.ts — the MapLibre v6 bootstrap (D-14, RESEARCH §Code Examples).
+ * ---------------------------------------------------------------------
+ * The style is the build-time-inlined Rams basemap JSON (liberty-rams.json
+ * via @araharah/theme/basemap — D-14, the style object is never re-set at
+ * runtime, D-10). v6 is ESM-only and WebGL2-only: `setWorkerUrl` is
+ * mandatory in bundlers (Vite's `?worker&url` emits a hashed asset),
+ * and the Map constructor throws `GPUInitializationError` on devices
+ * without WebGL2 — caught here and returned as null (RESEARCH Pitfall 5),
+ * so the shell can render its deliberate absent-map state instead of
+ * crashing (Open Question 1, answered in main.ts + the UI-SPEC amendment).
+ *
+ * The `RAMS-BASEMAP-READY` console prefix is load-bearing — the theme
+ * screenshot toolchain (theme/scripts/screenshot.mjs) and plan 03-04's
+ * capture race both wait on exactly that prefix.
+ */
+import { Map as MapLibreMap, setWorkerUrl, GPUInitializationError, type StyleSpecification } from "maplibre-gl";
+import "maplibre-gl/dist/maplibre-gl.css";
+import workerUrl from "maplibre-gl/dist/maplibre-gl-worker.mjs?worker&url";
+import ramsStyle from "@araharah/theme/basemap/liberty-rams.json";
+import { KL_CENTER } from "../location/types.ts";
+
+setWorkerUrl(workerUrl); // required for ALL bundlers in v6
+
+export function bootMap(container: HTMLElement): MapLibreMap | null {
+  try {
+    const map = new MapLibreMap({
+      container,
+      // resolveJsonModule infers `version: number`; the style spec needs the
+      // version literal — a Typed cast (never `any`, no shim) satisfies the
+      // StyleSpecification contract while keeping the build-time import.
+      style: ramsStyle as StyleSpecification, // inlined at build time (D-14) — NEVER re-set
+      center: KL_CENTER,
+      zoom: 13,
+      attributionControl: { compact: true },
+    });
+    map.on("error", (e: { error?: { message?: string } }) => {
+      const inner = e && e.error;
+      console.error("RAMS-BASEMAP-ERROR", inner && inner.message ? inner.message : inner);
+    });
+    map.on("load", () => {
+      console.log("RAMS-BASEMAP-READY layers=" + map.getStyle().layers.map((l) => l.id).length);
+    });
+    return map;
+  } catch (err) {
+    if (err instanceof GPUInitializationError) return null; // Pitfall 5: shell still renders
+    throw err;
+  }
+}
diff --git a/web/src/map/marker.ts b/web/src/map/marker.ts
new file mode 100644
index 0000000..059ea4c
--- /dev/null
+++ b/web/src/map/marker.ts
@@ -0,0 +1,75 @@
+/*
+ * marker.ts — the position marker (UI-SPEC §Position Marker + Accuracy Geometry).
+ * -------------------------------------------------------------------------------
+ * One DOM Marker carrying: the accuracy circle (radius = projected metres,
+ * display-capped at 100m — the truth stays in the strip telemetry), the 20px
+ * matte-black dot, and the heading cone rotated to `heading` only when a
+ * heading exists — hidden entirely on null (no default orientation guess,
+ * no half-open cone; T-03-16 honesty).
+ *
+ * Marker colors are Rams-constant under both Telegram themes (map-constant
+ * rule, D-10). Signal-lost dims the WHOLE group to 40% via data-stale.
+ */
+import { Marker, type Map as MapLibreMap } from "maplibre-gl";
+import type { Fix } from "../location/types.ts";
+
+const DISPLAY_ACCURACY_CAP_M = 100;
+
+export function accuracyRadiusPx(map: MapLibreMap, lat: number, metres: number): number {
+  const sw = map.getCanvas().width;
+  const mPerPx = (40075016.686 * Math.cos((lat * Math.PI) / 180)) / (sw * Math.pow(2, map.getZoom()));
+  return Math.min(metres, DISPLAY_ACCURACY_CAP_M) / mPerPx;
+}
+
+export function createPositionMarker(): {
+  marker: Marker;
+  update(map: MapLibreMap, fix: Fix): void;
+  setStale(v: boolean): void;
+} {
+  const group = document.createElement("div");
+  group.className = "pos-group";
+  const svgNs = "http://www.w3.org/2000/svg";
+  // The SVG carries EXPLICIT width/height/viewBox and every child carries explicit
+  // cx/cy. An <svg> with no width/height renders at 300x150 (or collapses) and a
+  // <circle> with no cx/cy lands at (0,0) — both make the marker invisible.
+  const svg = document.createElementNS(svgNs, "svg");
+  svg.setAttribute("width", "240");
+  svg.setAttribute("height", "240");
+  svg.setAttribute("viewBox", "-120 -120 240 240");
+  const circle = document.createElementNS(svgNs, "circle");
+  circle.setAttribute("class", "pos-accuracy");
+  circle.setAttribute("cx", "0");
+  circle.setAttribute("cy", "0");
+  const cone = document.createElementNS(svgNs, "polygon");
+  cone.setAttribute("class", "pos-cone");
+  cone.setAttribute("points", "0,-8 6,5 0,2 -6,5");
+  const dot = document.createElementNS(svgNs, "circle");
+  dot.setAttribute("class", "pos-dot");
+  dot.setAttribute("cx", "0");
+  dot.setAttribute("cy", "0");
+  dot.setAttribute("r", "10");
+  // cone + dot are SVG-NAMESPACE nodes: they MUST be children of the <svg>, never
+  // of the HTML <div> — an SVG element directly under a <div> is not rendered.
+  svg.append(circle, cone, dot);
+  // MapLibre owns this group's DOM once addTo(map) runs — it parents it into the
+  // map canvas wrapper. DO NOT document.body.appendChild(group): an un-parented
+  // body child has no positioning CSS and paints UNDER the `inset: 0` map, so the
+  // marker would be invisible even though it exists.
+  group.appendChild(svg);
+  const marker = new Marker({ element: group }).setLngLat([0, 0]);
+  return {
+    marker,
+    update(map: MapLibreMap, fix: Fix) {
+      marker.setLngLat([fix.lng, fix.lat]);
+      circle.setAttribute("r", String(accuracyRadiusPx(map, fix.lat, fix.accuracyM ?? 0)));
+      if (fix.headingDeg === null) cone.style.display = "none"; // hidden when unknown — never a half-open guess
+      else {
+        cone.style.display = "";
+        cone.style.transform = `rotate(${fix.headingDeg}deg)`;
+      }
+    },
+    setStale(v: boolean) {
+      group.dataset.stale = String(v);
+    },
+  };
+}
diff --git a/web/src/shell.css b/web/src/shell.css
new file mode 100644
index 0000000..4f3ccfd
--- /dev/null
+++ b/web/src/shell.css
@@ -0,0 +1,86 @@
+/*
+ * shell.css — the Rams chrome (UI-SPEC §Shell Layout & Register Bands).
+ * -----------------------------------------------------------------------
+ * Every value is a token reference (var(--color-*) / var(--spacing-*) /
+ * var(--type-*)); the only literals are the machined-border geometry the
+ * UI-SPEC enumerates (1px/2px rules, 8px lamp/gantry/notch, 40x40 plate,
+ -2px hit slop, 320px card max-width, 20px dot as SVG r=10). Zero
+ * roundedness (the one `border-radius: 0` reset pins MapLibre's chrome),
+ * zero transition/animation — state changes are instant hard swaps.
+ *
+ * D-10 / PX-02: NO MapLibre rule participates in theme slots. The map
+ * style is Rams-constant; only --shell-bg / --shell-on-surface re-slot
+ * behind [data-tg-theme].
+ */
+
+/* tokens.css wins; mockups lose. Value discipline per theme/src/components.css lines 9-15. */
+@import "@araharah/theme/dist/rams.css";
+
+* { box-sizing: border-box; }
+html, body { height: 100%; margin: 0; }
+body {
+  background: var(--shell-bg);
+  color: var(--shell-on-surface);
+  font: var(--type-body-md);
+  overflow: hidden;
+}
+
+/* PX-02 dark-slot activation (extends theme.css's media-query default) */
+[data-tg-theme="light"] { --shell-bg: var(--color-surface); --shell-on-surface: var(--color-on-surface); }
+[data-tg-theme="dark"]  { --shell-bg: var(--color-surface-dark); --shell-on-surface: var(--color-inverse-on-surface); }
+[data-tg-theme="dark"] .card { background: var(--color-inverse-surface); color: var(--color-inverse-on-surface); border-color: var(--color-inverse-on-surface); }
+[data-tg-theme="dark"] .card-header { border-bottom-color: var(--color-inverse-on-surface); color: var(--color-inverse-on-surface); }
+/* NO MapLibre rule here, by design (D-10 / RESEARCH Pitfall 7). */
+
+/* Research Open Question 1 — WebGL2 absent: shell renders over a Rams-tinted field */
+body[data-map="absent"] main { background: var(--color-surface-dim); }
+
+/* map register: full-bleed, the dominant surface */
+main { position: fixed; inset: 0; }
+#map { position: absolute; inset: 0; }
+.maplibregl-ctrl-attrib { border-radius: 0; background: var(--color-matte-black); color: var(--color-pure-white); font: var(--type-label-sm); letter-spacing: var(--type-label-sm-tracking); text-transform: uppercase; }
+
+/* top register: status strip */
+.strip {
+  position: absolute; top: calc(var(--safe-top, 0px) + var(--spacing-space-sm)); left: 0; right: 0;
+  display: flex; align-items: center; justify-content: space-between;
+  padding: var(--spacing-space-sm) var(--spacing-space-md);
+  min-height: 32px;
+  background: var(--color-matte-black); color: var(--color-inverse-on-surface);
+  font: var(--type-label-sm); letter-spacing: var(--type-label-sm-tracking); text-transform: uppercase;
+}
+.strip .lamp { width: 8px; height: 8px; border: 1px solid var(--color-pure-white); }
+.strip .lamp[data-state="acquiring"], .strip .lamp[data-state="validating"], .strip .lamp[data-state="awaiting"] { background: var(--color-signal-orange); }
+.strip .lamp[data-state="live"] { background: var(--color-olive-green); }
+.strip .lamp[data-state="lost"], .strip .lamp[data-state="denied"] { background: var(--color-functional-red); }
+.strip .telemetry { font: var(--type-label-sm); }
+
+/* center register: boot / denied / lost card */
+.card-stack { position: absolute; left: var(--spacing-margin); right: var(--spacing-margin); top: 50%; transform: translateY(-50%); max-width: 320px; margin-inline: auto; }
+.card .gantry { width: 8px; height: 8px; border: 1px solid var(--color-matte-black); }
+.card .gantry[data-fill="on"] { background: var(--color-signal-orange); }
+.card-actions { display: flex; gap: var(--spacing-space-sm); padding-top: var(--spacing-space-sm); }
+
+/* bottom register: recenter control (40x40 plate, >=44x44 hit target) */
+.recenter {
+  position: absolute; right: var(--spacing-margin); bottom: calc(var(--safe-bottom, 0px) + var(--spacing-space-sm));
+  width: 40px; height: 40px; padding: 0; border: 0; border-radius: 0;
+  background: var(--color-matte-black); color: var(--color-pure-white);
+  display: flex; align-items: center; justify-content: center;
+}
+.recenter::after { content: ""; position: absolute; inset: -2px; }
+.recenter .notch { width: 8px; height: 8px; background: var(--color-signal-orange); }
+.recenter[data-follow="free"] .notch { display: none; }
+/* UI-SPEC §Follow/Recenter Control, third notch state: live-but-LOST (no fix).
+   soft-beige, NOT red — red is reserved for the strip/degraded registers; the notch
+   reads "unlocked, not error" (RESEARCH Pitfall 8 orange discipline). */
+.recenter[data-fix="lost"] .notch { background: var(--color-soft-beige); }
+.recenter:active { background: var(--color-signal-orange); color: var(--color-matte-black); }
+
+/* position marker (DOM Marker children) */
+.pos-accuracy { fill: var(--color-matte-black); fill-opacity: 0.06; stroke: var(--color-matte-black); stroke-opacity: 0.30; stroke-width: 1; }
+.pos-dot { fill: var(--color-matte-black); }
+.pos-cone { fill: var(--color-signal-orange); }
+.pos-group[data-stale="true"] { opacity: 0.4; }
+
+/* No CSS transition or animation anywhere — state changes are instant hard swaps. */