I'm making a trip from Deale MD to Oriental NC on my O'Day 28 and have a need to maintain at least cell phone accessibility and most of the time I need to have data network accessibility while sailing or motoring down the ICW. I'm wondering how good the coverage is? I have AT&T and Sprint cell phones. I could buy a Verizon device to have data coverage if that would really help. Coverage maps from the carriers that I've found only show their land coverage, not coverage over the bays or sounds.