With Garmin?s U.S. Topo DVD and your PC, you can download detailed topographic maps to your compatible Garmin GPS. These maps are comparable to the U.S. Geographical Survey’s 1:100,000-scale paper maps. You’ll see terrain contour, elevation information, shoreline detail, bathymetric contours, hiking and snowmobile trails and more. You can also use MapSource to create routes and waypoints on your PC and transfer them to your GPS. The 2008 update includes coverage for Puerto Rico, increased POI data base, DEMs(Data Elevation Models) allow for terrain shading on the PC, DEMs(Data Elevation Models) allow for the elevation profile of a route on select GPS units (60CSX for example) and on the PC, and is now DVD based vs CD-Rom. The map download feature of the U.S. Topo CD is recommended for use with the following units (Some units may require a Garmin data card to upload map data): Astro 220 eMap eTrex Legend eTrex Vista GPS III Plus GPS V GPS 12MAP GPSMAP 60 GPSMAP 60C/60CS GPSMAP 60 Cx/CSx GSPMAP 76Cx/CSx GPSMAP 76/76S GPSMAP 76C/76CS GPSMAP 162/168 GPSMAP 176/176C GPSMAP 276C iQue 3600 Legend Cx Legend HCx NavTalk Rino 120 Rino 130 Rino 520 Rino 530 Rino 520 HCx Rino 530 HCx Summit HC Venture Cx Venture HC Vista Cx Vista HCx More units may apply. To check your unit for compatibility, call Garmin?s Customer Support at 1-800-800-1020.