Can I transfer raster maps, such as the MacTopos maps that James Associates Inc. sells, into my GPS receiver using MacGPS Pro?
Unfortunately, GPS receivers use vector-based maps for display on their screens. They have no support for raster maps. USGS DRG (Digital Raster Graphics) maps have too much detailed information for the memory and display capabilities of a hand-held GPS receiver. The best use of DRG maps, and the use which MacGPS Pro navigation software provides, is to use the map on your Macintosh screen. You can plan a trip by generating waypoints and routes to transfer to your receiver. You can use the map on your Mac screen in real time as you travel with the GPS receiver connected. After your trip, you can transfer tracklogs from the GPS to view where you went on the DRG map.
Unfortunately, GPS receivers use vector-based maps for display on their screens. They have no support for raster maps. USGS DRG (Digital Raster Graphics) maps have too much detailed information for the memory and display capabilities of a hand-held GPS receiver. The best use of DRG maps, and the use which MacGPS Pro navigation software provides, is to use the map on your Macintosh screen. You can plan a trip by generating waypoints and routes to transfer to your receiver. You can use the map on your Mac screen in real time as you travel with the GPS receiver connected.
