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In Basecamp, I'm seeing two sets of many major roads. 
I've got City Navigator installed on a microchip in my Montana 600 and I've selected City Navigator as the "map product to display" in Basecamp.  But depending on the map detail setting and my zoom level, I see the roads from the "Global Map" layer in addition to the CN roads.  How can I make the global map not show up at all when I'm using City Navigator? (I'll still want to use the Global Map occasionally when I don't have the Montana plugged into the computer).

Nei, forske på geologien i Linnédalen. Har du besøkt det?
Ja, problemet med å få kartet til å dukke opp på optimale zoomnivåer på Montana. Deaktivering av den globale basekartet løst problemet. Nå kan jeg scooter til Kapp Linné i en snøstorm!

(No, researching the geology in Linnédalen.  Have you visited there?
Yes, the problem was getting the map to show up at optimal zoom levels on the Montana. Disabling the the global basemap solved the problem. Now I can scooter to Kapp Linné in a blizzard!).

Great - thanks for all you help.  My wife says there are real chores to do and I need to stop obsessing over this map!  But at least I've learned more about my Montana gps unit.

popej - here's are all the lines of the Map Properties / Levels settings in GPSMapedit.  It's quite a while since I created this map and I've forgotten exactly how these settings work.  I do remember adjusting them to get my map to work right on my 76CS.  Any suggestions for improving these settings?

Level      Bits      Latgrid      GPS zoom      MapSourcezoom
Level0=    22      9.5 m      500 m            Zoom0=2 (3 – 8 km)
Level1=   21      19.1 m      800 m – 1.2 km   Zoom=3 (8 – 12 km)

sroof, to draw on top of the base map your Drawpriority needs to be higher than the basemap's Drawpriority.  Default cgpsmapper Drawpriority is 25, if you don't set any.  Do you know what Drawpriority your map has? 

Seldom - thanks.  I don't what the Drawpriority level is for my map.  Where do I set it?  I'm using GPSMapedit to create the map (in MP format), then use the GPSMapedit Export function which sends it to cgpsmapper and creates the IMG file.  This process doesn't give me the opportunity to interact directly with cgpsmapper.

aah - yes. 
Increasing the Detail in Advanced Map Setup to "Most" helped some - I could then see my map when zoomed out to 0.5 mile on the scale bar.  I played around, turning on and off the Auto Zoom and changing the various Zoom Levels, but changing these didn't make any difference.

But disabling the "Worldwide DEM Basemap NR" did the trick - now I can see my map at all zoom levels. Perfect!  Except it would be nice to have both map available at the same time.
Does anybody know a way to set a custom map so it's compatible with the Worldwide basemap?  Perhaps changing the zoom levels in GPSMapEdit?
(I'll try to experiment with these settings, or perhaps even RTFM tomorrow).

Using the great tutorials provided at this site, I successfully uploaded a custom map I made using GPSMapEdit to both my Garmin 76CS and my new Montana 600 using Basecamp.  The map works perfectly on the 76CS, but on the Montana, my map only shows up when I'm zoomed waay in, only after the scale bar is 500 ft or less.  When I zoom out more than this (i.e. scale bar is 700 ft or larger), my map is not shown.  I'd like my map to show at zoom levels of 3 miles and closer on the Montana (my map shows up at all zoom levels on the 76CS).  So how how do I make this change?  Do I need to do it in GPSMapEdit (perhaps in the Map properties settings?) or can I set the visible zoom range in Basecamp?  Or do I set this in the Montana?

BTW, my custom map is for the Kapp Linné area of Svalbard (Spitsbergen), where I run an research/educational program.  I'm happy to share it once I get it working right.

Thanks.

Hi,
   I'm having fun playing with my new Montana 600.  Is there a way to access the custom maps folder using the Montana unit so I could rename the file extension of some maps in it?  I've got several excellent custom maps (kmz format) installed from this site and a couple overlap.  Since all the custom maps can only be turned on or off as a group, I've renamed the extension of the map I don't use so often, which disables it.  It would be nice to be able to use the Montana to change the file extension back to kmz when I want to re-enable the map.

I downloaded a couple of 7.5' USGS maps for my region - very nice results!  But it took me a couple of test downloads to figure out how setting the Target Zoom to different numbers affected the final map.