How To Use A GPS: Coordinate Systems and Datums
When you use a
GPS, it's important to not only have an understanding of how the unit works and receives the information it provides but also the languages it "speaks." If we don't truly understand these languages and how, why, and when to change from one to another, a GPS can end up being more of a hindrance than a help.
What it comes down to is that relying on a gadget we don't understand can get us into trouble. When we're talking about using a GPS, trouble means getting lost.
So in this second article in a series, I'll cover the basic principles of
coordinate systems and map datums and how they relate to GPS use. This is intended to be an introductory overview, so I'll direct you to some additional reading material on these topics in case you want to learn more and get even more out of your GPS.
http://www.squidoo.com/GPS-coordinate-systems-datums Enjoy