Garmin GPS devices read and display mapping according to its gps mapping programs. As I know garmin gps mapping display in the following hierarchy:
* City Navigator
* City Select
* MetroGuide
* MetroGuide Canada
* BlueChart g2 & BlueChart g2 Vision
* BlueChart
* LakeMaster
* Lakes
* Fishing Hot Spots
* US Recreational Lakes with Fishing Hot Spots
…

free gps mapping intructions:GPS by itself helps us only to know where the device is in space. However this has to be combined with mapping for many of the practical applications of GPS. The mapping part enables the user to work out possible routes and plan trips in advance. It is often this mapping component that adds to the price of a GPS package. The mapping data has to be accurate and be updated often.
There are different kinds of maps for different users and kinds of needs. For instance, road …