Good advise Terry, but a word of caution, one still needs top use some common sense also while using a GPS unit while most are fairly acurate, don't make the same mistake that I did last summer and have funnel vision with the GPS. I was looking for a particular spot on a well known lake that has a sunken railroad track and while staring at the GPS unit I still hit the dam thing, just lucky I was at a crawl and didn't do any damage to my outdrive.
Whopper