Glenn Housman of FMT (Florida Marine Tracks) shows how his product works on a Simrad unit in the Lower Florida Keys. This is significant because this is a very tricky path to run. It can be done under good tide conditions with good light, but the repercussions of being even slightly off track are serious.
The Lower Florida Keys are home to some of the best fishing and also the fewest boats found almost anywhere in the entire chain of the Florida Keys. Why? It is because the bottom is concrete hard and extremely unforgiving. Many lower units have met their watery grave in these waters.