Looking to cancel my home internet and go either At&T,werizon,sprint wireless card for my laptop. I'm a commercial diver so I'm gone a week at a time or 3-4 weeks.. The Boat doesn't go out very far maybe 10 or so miles. When I have a job that's a few hours out will these cards be able to pick up? Are they ran by satellite or only cell phone towers? Anyone work offshore that can point me in the right direction?