You didn't say where you sail and what kind of sailing you do (day-sailing cruising racing). But as far as I am concerned there is no option for a first choice. I recommend a chart-plotter. They are weather proof and pretty hardened for sailing. The PC/iPad options make plenty of sense as a backup or a 2nd item. Neither is waterproof and really intended for a cockpit use. While they might be fine for a nice sunny afternoon, I wonder about how they would be in a squall etc.
I sail the Chesapeake Bay and it has excellent wireless connection (my verizon cell works every place I have tried it, I don't know about ATT for the iPad).
Sailing on The Central Chesapeake Bay, West River, MD on my Catalina 27, Aelous II with my wife and friends.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.