I use my 170cc/75 e-tec on inland lakes in Fla, SC, NC, and the ozarks as well as inshore gulf waters west coast of Fla never more than 3 miles out usually around Cayo Coata and places like that and also Crystal River area for scallop diving....what should I have for VHF and do i really need GPS? looking for all advice i can get as I am new at the salt water thing.. i do have a salt water trolling motor on the bow also..what is the shallowest you run in with your 170cc ? thanks for your opinions.