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I may have figured some of this out, by accident. I reinstalled the Michigan Topo, this time keeping all of the maps intact, since I thought I might have done the selection part incorrectly somehow.

I also went back into BaseCamp and manually moved my selected waypoints onto the device. This time it worked and I can see my new map.

Is there a step by step manual somewhere for the Etrex 20? The Garmin Manual has none of this detail.

I'm another newbie with a similar question on my new eTrex 20. I found that the only way I could view my newly installed custom map was to disable all the other maps, including the basemap that came with the device.

I also found that the only way I could view my added waypoints was to connect the garmin to the computer and load them directly from BaseCamp.

Take all this with a grain of salt, please--I'm just stumbling around with this new Garmin. My older Garmin, an ancient Vista, didn't have any of these abilities, so it was far simpler to use.
Cheers-
Nancy

HI-
I've just purchased a Garmin etrex 20, after 8 years of using an old, reliable, non-mapping Garmin Vista. My computer is a mac; I have basemap and mapinstall installed.

So far, I've followed the tutorials here to use Basemap to get Michigan Topo, and I've added several campsite waypoints for our upcoming 8 day paddle on Isle Royale. So far, so good.

Then I followed the tutorial to use MapInstall to select the correct maps from the Michigan Topo for our trip,  and I installed them onto the Garmin etrex 20. No problem

Great. Then I used the tutorial to change which map is displayed on my Etrex 20:

And this is where I run into problems, since the tutorial isn't the same as the new Etrex 20. I follow the directions, and get to  the "select map" menu on the Etrex 20. I push the button and get a choice of 3 maps: the basemap that came with the Etrex, a Demo map that Garmin stuck on here, and my map (mitopo11). I enable it. The menu then pops me back to the three maps, all enabled.

Now what? I want to view the waypoints and the map for the Michigan topo (I'm in Wisconsin now). Nothing shows up. I go and disable the other two maps, so only my new Michigan map is enabled. But nothing shows up--my waypoints aren't there, the map doesn't seem to be viewable.

What I have done wrong? The Garmin manual seems remarkably useless. Am I missing something incredibly basic? After 8 years of using a non-mapping Garmin, I didn't think this new mapping one would be so bewildering!