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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?

Why do Garmin topo maps (I have the Topo Southwest 24) have no delineation for forest shading and open grassy or rocky areas.  Mountain areas with forests appear as a solid green. National Geographic topo maps have this feature.  Can I get it for my Garmin (Oregon 550)?