For Marine Radios, Most Charter boats use 19 Inshore Inshore and 80 Offshore, buttttttttt they have evolved to using Satellite Phones and special Channels, even computer stuff. Nobody wants to give away their position if they are catching fish and want to call in friends. Most boats use two Radios, one on scan. If you are a Fisherman and a Tech Person, you have an integrated system. Radar will give you positioning.