The app displays two GoogleMaps™ on a single screen. The map is scaled by its latitude; you can compare islands/buildings each other with correct scale.

You can rotate/zoom the maps by multi-touch, but tilt is intentionally disabled. No location search/route search available (it requires a fee for Google LLC)

Touching Google™ icon at left-bottom switches map type. You can switch the type to terrain, satellite-hybrid, satellite, and normal. Long-tapping the icon will overlap the current map to the other. With two spinners, you can change Hue and Opacity of the overlayed map. Enjoy!