Mapset Interference on Garmin GPSmap 276C

JRhetts

Adventurer
A question:

I have three map sets installed on my Garmin GPSMap 276C:
-Montana Topo Maps [from http://www.miscjunk.org/mj/mp_mttopo.html]
-Garmin CN North America NT 2010.10
-Garmin Americas Autoroute Basemap

If I have all three enabled, I ONLY see the topographical information at one scale (.5 mi). If I zoom in more or less than this, I get no topo information (e.g., contour lines)

But, if I ONLY enable the MT Topos (or MT Topos + Autoroute Basemap), I get topo info at 1.2 mi and continuously as I zoom in further (even to the max 20 ft level).

So, it appears that the Garmin CN North America NT 2010.10 mapset interferes with the topo information.

Why? any workaround?

Thanks, John
 

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