Mount the device on a stable surface as high up as possible, with minimal obstructions.
The system relies on a strong GPS signal from multiple satellites to provide accurate positioning and prevent false alerts. Satellite signals come from above and can pass through a layer of fiberglass, but metal, multiple layers of fiberglass, wood, or insulation may block the GPS signal. The app will display the GPS signal quality on the last update.
The 4G signal travels horizontally, so if the GPS signal is strong, the 4G signal is usually good as well.
For aluminum, steel, or carbon boats, we recommend installing the main unit on an exterior surface.