I am going on a cruise. I would like to be able to look at the current ships position on my Nexus 7 but without a WiFi connection. WiFi connections are very expensive on a ship not to mention slow. We will be in the Eastern Caribbean. St. Thomas, Antigua, St. Lucia, Barbados, and St. Kitts. Is there a app that would suit my needs? I don't need navigation obviously, just want to pinpoint our ships location. I am assuming I would need to also pre-load maps of that whole area somehow. Can anyone help me?