The love child of two-way Family Radio Service (FRS) and Global Positioning System technology, the Rino 110 ($169) from Garmin does more than simply keep track of your location: It beams your position to others in your group who are using the same radio, and plots everyone’s whereabouts on its LCD. It’s also completely waterproof,
for FRS radios.
A higher-end Rino 120 model ($249) is also available. It has the same features, but adds 8MB of internal memory
and additional mapping capabilities.