How can an installer verify correct GPS sentence to a marine DSC VHF radio?

To verify that the GPS sentence being received by a marine Digital Selective Calling (DSC) VHF radio is correct, the best method is to look for latitude and longitude on the display. This is because the DSC function relies on precise geographical data to enable effective communication for emergency responses and navigational purposes.

When the latitude and longitude coordinates are displayed accurately on the radio's screen, it indicates that the GPS is functioning properly and providing valid data to the device. This verification ensures that in the event of an emergency, the radio will be able to accurately transmit the vessel's location to rescue services.

While checking the speed of the vessel, performing a signal strength test, and reviewing the last position fix logged may provide useful information about the vessel's navigation and GPS functionality, they do not directly confirm the real-time accuracy of the current GPS sentence as clearly as the display of latitude and longitude does. Thus, option B is the most reliable way to verify the GPS sentence's correctness.