Quote:
Originally posted by Ekke:
...I was surprised to see that not only was the trail on the map but that it was "routable" on the GPS!
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Ekke:
Canada Topo does not support autorouting on any GPS. What you saw happening was this: Your GSR has a routable 'basemap' burned into it - it came with this basemap, you can't turn it off, and you can't update it. The GPSR was using the information from the underlying basemap to generate the route, not the information from Topo Canada.
There's an easy way to observe this: Remove all the cartography from your GPSR (meaning, pull out the data chip or CF card, or, turn off the maps on a GPSR than stores the maps in non-vol memory), then turn on the GPSR and have a look at the screen. What you will see is the burned in basemap.
The basemap serves several purposes, one is to support rudimentary routing in the absence of loaded cartography that has routing guidance, the other is to give you some functionality if you have no cartography at all loaded, and last is to draw the picture on the map at wide zoom levels (typically greater than the 5 mile / 8 km setting), when the picture doesn't need the detail that is present in the cartography loaded on the chip.
Michael
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