diff --git a/src/components/space/carto/Map.js b/src/components/space/carto/Map.js
index eaf6a9c..a7012e8 100644
--- a/src/components/space/carto/Map.js
+++ b/src/components/space/carto/Map.js
@@ -573,7 +573,7 @@ function mapStateToProps(state) {
       },
     },
     ui: {
-      tiles: state.ui.tiles.current,
+      tiles: selectors.getTiles(state),
       dom: state.ui.dom,
       narratives: state.ui.style.narratives,
       mapSelectedEvents: state.ui.style.selectedEvents,
diff --git a/src/components/space/carto/atoms/__tests__/SatelliteOverlayToggle.spec.js b/src/components/space/carto/atoms/__tests__/SatelliteOverlayToggle.spec.js
new file mode 100644
index 0000000..6dae582
--- /dev/null
+++ b/src/components/space/carto/atoms/__tests__/SatelliteOverlayToggle.spec.js
@@ -0,0 +1,56 @@
+import React from "react";
+import { fireEvent, render, screen } from "@testing-library/react";
+import SatelliteOverlayToggle from "../SatelliteOverlayToggle";
+import "@testing-library/jest-dom";
+
+describe("<SatelliteOverlayToggle />", () => {
+  it("disables the currently selected default option", () => {
+    render(
+      <SatelliteOverlayToggle reset={jest.fn()} switchToSatellite={jest.fn()} />
+    );
+    expect(
+      screen.getByRole("button", { name: /satellite/i })
+    ).not.toBeDisabled();
+    expect(screen.getByRole("button", { name: /default/i })).toBeDisabled();
+  });
+
+  it("disables the currently selected satellite option", () => {
+    render(
+      <SatelliteOverlayToggle
+        isUsingSatellite
+        reset={jest.fn()}
+        switchToSatellite={jest.fn()}
+      />
+    );
+    expect(screen.getByRole("button", { name: /satellite/i })).toBeDisabled();
+    expect(screen.getByRole("button", { name: /default/i })).not.toBeDisabled();
+  });
+
+  it("calls the reset function when switching to the default overlay", () => {
+    const mockReset = jest.fn();
+    const mockSat = jest.fn();
+    render(
+      <SatelliteOverlayToggle
+        isUsingSatellite
+        reset={mockReset}
+        switchToSatellite={mockSat}
+      />
+    );
+    const btn = screen.getByRole("button", { name: /default/i });
+    fireEvent.click(btn);
+    expect(mockReset).toHaveBeenCalledTimes(1);
+    expect(mockSat).not.toHaveBeenCalled();
+  });
+
+  it("calls the switchToSatellite function when switching to the satellite overlay", () => {
+    const mockReset = jest.fn();
+    const mockSat = jest.fn();
+    render(
+      <SatelliteOverlayToggle reset={mockReset} switchToSatellite={mockSat} />
+    );
+    const btn = screen.getByRole("button", { name: /satellite/i });
+    fireEvent.click(btn);
+    expect(mockSat).toHaveBeenCalledTimes(1);
+    expect(mockReset).not.toHaveBeenCalled();
+  });
+});
diff --git a/src/reducers/__tests__/ui.spec.js b/src/reducers/__tests__/ui.spec.js
new file mode 100644
index 0000000..c2e2d20
--- /dev/null
+++ b/src/reducers/__tests__/ui.spec.js
@@ -0,0 +1,23 @@
+import { useSatelliteTilesOverlay, resetTilesOverlay } from "../../actions";
+import initial from "../../store/initial.js";
+import ui from "../ui";
+
+describe("UI reducer", () => {
+  it("can change the tiling", () => {
+    const result = ui(initial.ui, useSatelliteTilesOverlay());
+    expect(result.tiles.current).toEqual("satellite");
+    expect(result.tiles.default).toEqual(initial.ui.tiles.default);
+  });
+
+  it("can revert to the default tiling", () => {
+    const result = ui(
+      {
+        ...initial.ui,
+        tiles: { default: "some default", current: "something else" },
+      },
+      resetTilesOverlay()
+    );
+    expect(result.tiles.current).toEqual("some default");
+    expect(result.tiles.default).toEqual("some default");
+  });
+});
diff --git a/src/selectors/index.js b/src/selectors/index.js
index 63ea94a..61c1e93 100644
--- a/src/selectors/index.js
+++ b/src/selectors/index.js
@@ -39,6 +39,7 @@ export const getTimelineDimensions = (state) => state.app.timeline.dimensions;
 export const selectNarrative = (state) => state.app.associations.narrative;
 export const getFeatures = (state) => state.features;
 export const getEventRadius = (state) => state.ui.eventRadius;
+export const getTiles = (state) => state.ui.tiles.current;
 
 export const selectSites = createSelector(
   [getSites, getFeatures],