gps coordinates

Hi, I was just wondering if anyone here uses a GPS tracking tool to save the coordinates of the findings? If yes, which one are you using? Thank you!

Has anyone ever seen or used the guide books that are put out by Kellyco for about $16? There is one for just about any state, there are a few that don't have one.....yet. It is supposed to have GPS coordinates, as well as maps, to good places (guess I should have put "potentially" in front of...