On National Geographic and USGS topos the maps are shaded green for wooded cover and are left white for grassy or rocky areas. The Garmin maps will shade the entire area as green not distinguishing between wooded and non-wooded areas. Nat Geo maps that can be used with the Magellan Triton series GPS can use these Nat Geo maps and the user can navigate using this added information. This information can be useful for navigating, hunting, rock climbing, etc. However, I have a Garmin GPS and want to know why Garmin maps lacks this feature? Or are there maps with wooded cover shading available for the Garmin?