That's what I like about the Delorme's Earthmates plus I can download areo photos so it's like google earth and also put in lake depths.. The Earthmates are used by state police as well so they are pretty accurate..

Here is a few reviews for you to see for yourself.. Can't get any simpler than this.. nough said except I am currently checking out the all new Eartmate PN-40. I would like to see the reviews on this one. None of these has any sort of walkie talkie though..

www.delorme.com//about/reviews/PN20_GPSReview.htm