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There's Garmin's legacy program, Mapsource, that was discontinued a number of years ago. It will use the same maps that are already installed in Basecamp. It's worth a look, but if you are looking for something "intuitive" then you may not be impressed. :) https://www8.garmin.com/support/download_details.jsp?id=209
Also "Tyre to Travel" which was originally a shareware program that only worked with TomTom devices, but the new version also supports Garmin. www.tyretotravel.com
3000 segments is the total of all the segments of all the maps installed everywhere. So you need to add the segments of the maps in internal memory plus any maps on the card. You also need to add any mapping that was originally included on the device, such as the basemap. It makes no difference if a map is disabled, it still counts towards the 3000 limit.
I don't understand how two maps could have zero segments. Perhaps they are the timezone map and something similar? All that will be significant are full map products that you have installed.
Actually it's not that easy. Don't know about the EU, but here in the US, Garmin no longer sells maps that you can install on your computer. Period. In the past, the only way to do this with a purchased Garmin map was to get the DVD version. Garmin discontinued these several years ago.
Now City Navigator is a separate case, if you have a device with a pre-installed City Navigator Map (mostly automotive devices), then you can use Express to install the map on your computer. AFAIK, this is not possible with any other Garmin maps.
But I just had a chance to fire up my PC and checked one other thing for you. It is very simple to see how many map segments you have on your GPS, just get Javawa's free Device Manager program
Connect your GPS and run this program. It will scan the device and report how many segments are installed on the main screen.
Also, Garmin used to have a very useful page that summarized the file specifications for all their devices, but the link no longer works and I couldn't find it elsewhere. Typical Garmin. :O)
But this site has an even better summary than Garmin's original:
they say the GPSMap64 allows approximately 3000 segments
If you have too many segments in your installed maps, it will cause problems, even if the map is disabled. City Navigator typically doesn't have a lot of segments and should not be a problem. Not familiar with EU topo maps, but with their US 24k topo map products, there are a lot of segments. If you install just one of these plus City Navigator, you will probably be close to the limit of the device.
With maps installed on your computer, you can see the number of segments with Mapsource. I'm not sure offhand how to do this with maps that Garmin distributes as downloads. But one simple test would be to just remove one of the maps and see if the problem goes away.
Generally speaking, if you install 16gb of maps, you are likely at or beyond the segment limit. But of course, it depends on the specific maps.
Your favorite unit is one that was ridiculously overpriced, a huge failure for Garmin and was discontinued some time ago. That speaks volumes in itself! >:)
Aside from all my Garmin criticisms, something odd is happening to @samogps . You really should not have that many problems. Garmin simply wouldn't survive as a company if these problems were common.