A GPS system uses triangulation to locate a signal; this signal is sent out via a GPS devise. GPS mapping software uses this method of triangulation to map out an area. This system of GPS mapping was first used by the military and civilian use did not start until recently. GPS mapping is a useful and efficient way of mapping out large areas as well as hard to reach areas as well. The mapping method does not necessary require human intervention.
GPS mapping software uses a scanned or digital image can creates waypoints, routes and tracks based on it. GPS mapping software meant for personal use can help you plot your GPS information as a map as well as add annotations in text or image format.
A GPS mapping software can also gather your current position at intervals and show this information on a graphic map display. For diagnostic purposes an interface monitor is also available. A GPS mapping software can also show current position, time and speed on the position screen.
A good practice would be to choose software and use it in demo version first to see if you feel comfortable with it before you go ahead and purchase the software.