While trying to figure out how best to import custom maps for use on my Garmin 66i, I encountered something unexpected. I used the Flood.kmz add-on (discussed by VK2GOM on his blog) to check the AZ for a summit I’ve activated before. I then overlayed in Google Earth a map I made in Caltopo that shows a successful route I took to a summit. The overlay route in Google Earth showed small route segments that cross into the AZ. However, in Caltopo, those same route segments are not in the AZ. Hovering my mouse over those route segments in Caltopo and Google Earth displays different elevations for the same locations in each tool.
I made sure my DEM shading in Caltopo used meters to match the flood.kmz units. I also changed the contour interval in Caltopo to 5 meters, and the number of contour lines counts out to 25m, consistent with the DEM shading occurs.
Has anyone else ever seen this? I was hoping to generate a KMZ map from Google Earth with Caltopo overlays that I could use in my Garmin, but now I’m not sure which tool to use even standalone given this disparity.
73 Paula k9ir