Last September, I purchased an 88, 40ft double cabin On Lake Erie and stored it there over the winter. This June, I plan on piloting the boat down to my home on the west coast of Florida. I recently purchased a Raymarine Axiom 9 with a Navionics chip for my basic navigation. However, I would also like to add a tablet as back up and load it with Aqua Map and Navionics and perhaps overlay Bob 423 tracks and routes. I have to admit, I know nothing about this. I guess my first question is: what features do I need on the tablet? Cellular? GPS? 4G, unlocked? Etc.? The second question is do I need to add a phone line at $20 per month?
Thanks for your help
Larry