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Sorry, it's been awhile since I used mapsettookit and cgpsmapper. And you really haven't given us much info for troubleshooting.

You don't really say, were these same maps working correctly on your GPS before you revised them? If so, are your still using the same GPS or have you gotten a new one?

How did you "open them on the GPS"? Did you use MapInstall to send them to the GPS from Basecamp?

Did you save a copy of the old (working) map files from the GPS? Do those still work correctly today?

The fact that you got a new computer raises a question... did you move the old maps from your old computer? If so, in most cases simply copying the files isn't good enough because the Windows registry is invovled (I assume you're using Windows). This free program can properly move your old maps to a new computer.

https://www.javawa.nl/gmtk_en.html

That same program can also check your installed maps and flag any potential errors. It can even fix problems in some cases, so it might be worth a try. This program can also be helpful with map files on the GPS itself

https://www.javawa.nl/jdm_en.html

Unfortunately, the author had a stroke some years ago and had to stop updating his software.

Just a few thoughts, since nobody else seems to be responding.

Sounds like it actually works about the same as other devices and the issue was your memory card. Surprised that Garmin was so helpful, but it's great that they were.

Thanks for following up!

Garmin is pushing a subscription to something called "Maps Plus" for this device. They claim it includes scans of the classic USGS topo maps (and lots of other stuff).

https://support.garmin.com/en-US/?faq=0QeQKEZzTe3SfxvuUDuUZA&partNumber=010-02812-00&tab=topics&topicTag=region_maps

You might want to ask at that other site I linked to above. Unfortunately, things are pretty dead around here anymore (except for the endless spammers I ban every day    )

Not sure if you will get any help from Garmin, in the past they have just blown off any questions about third party maps. But do let us know if you find an answer.

I don't know anything about the GPSMap67 and gave up on Garmin awhile ago. Hard to believe that it wouldn't work with standard Garmin maps, but anything is possible with Garmin anymore. This post claims they do not work

https://gpsrchive.com/Discussion/viewtopic.php?p=11121#p11121

"All other unofficially unlocked Garmin maps that can be found on the internet will apparently not work due to new protections implemented by Garmin. These cannot be patched at the time of writing because the firmware is encrypted."

But other posts in the thread suggest that it is possible. Have you tried directly copying the .img file from another GPS (as opposed to sending a map using MapInstall)?

Garmin used something called webupdater in the past, but AFAIK that is no longer supported by browsers or by Garmin. If you go to the download page, it tells you to use Garmin Express

https://www8.garmin.com/support/download_details.jsp?id=5553

I am fully settled into my "post Garmin" period and haven't updated any of my old devices for quite awhile. But here's Garmin Express. In theory, you can just plug the eTrex into your computer and run Express. It should tell you whether any updates are available.

https://www.garmin.com/en-US/software/express

AFAIK, Current.gpx is a special filename reserved for system use, so I'm not surprised you had problems there. That file is normally created automatically each time a Garmin GPS starts up. I would try a different filename. I believe that Garmin software uses the name Temp.gpx when it sends files from Basecamp/Mapsource.

Have you tried using Basecamp and/or Mapsource to send your waypoints instead of directly copying the file?

Oh yeah, one other thing I remembered. If you used Basecamp or another program to transfer routes/waypoints/etc that may have left additional .gpx files on the Nuvi (look for a file named Temp.gpx). What you really need to do is delete ALL .gpx files from the Nuvi while it's connected to your computer.

When the Nuvi starts, it looks for any .gpx files, regardless of name. It then compares the data in the file(s) to your user data and will add data from the file if it doesn't already exist on the device.

So, be sure there aren't any files with .gpx extensions remaining on the Nuvi while it's connected to your computer.

By "user data" I assume you mean tracks, routes and waypoints? Been awhile since I used a Nuvi, but IIRC this is the result of a file named Current.gpx that the Nuvi automatically creates. Again, this is just from memory, so I may be getting something wrong...

Whenever the Nuvi starts up, it dumps all your user data into a file named Current.gpx. If that file doesn't exist, it creates it. So, the problem is, you can delete all your user data but that won't remove this file. And the Nuvi automatically imports any data it finds in gpx files when it starts. So, it will just re-import all your deleted data from the old Current.gpx file.

Try this - delete all your data the usual way on the Nuvi, then plug it into your computer before doing anything else. Now find the Current.gpx file (it *may* be in a folder named GPX - don't remember). Now disconnect the Nuvi and restart it. Since the Current.gpx file is now gone, the Nuvi should not re-import anything.

Maps must be properly installed on your computer before you open Basecamp. Almost all maps here include an installer program (.exe file). Run the installer and follow the instructions.

Now open Basecamp and you should see the map on the menu.

Cool! 

Actually, I was getting the Overlander confused with the Tread, which has a 10" screen and costs $1500 USD

https://www.garmin.com/en-US/p/732617/pn/010-02509-00

But now I see that the Overlander has a 7" screen for $700 USD, so now I understand how you were able to find a used device at an affordable price.

https://www.garmin.com/en-US/p/685257

But tell us more about Android on the Overlander, does it have a regular web browser, such as Chrome?

I use iOS myself, but have a few Android devices for experimenting/testing. I install Termux which gives me a Linux subsystem on Android where I run a local webserver. I can then access maps stored on the SD card using a web app in Chrome with no internet connection.

My own map-making concentrates on the Northeastern United States, so I'm not sure what might work well for you, sorry. However oruxmaps might be an option, since it does not use Google Play and offers various downloadable maps.

I have used my iPhone and iPad with different apps which works fine, but I was looking for a unit that don't need an internet connection and have all maps you need preloaded.     

You can install maps on iOS devices and use them without an internet connection. I used to make maps for iOS and Android devices but stopped a few years ago because the process was too complicated for most people and used Mobile Atlas Creator - a free open source program that was just too quirky and buggy for me. But you might take a look, it runs on Windows and Macs and allows you to download maps from a number of sources and format them for many different apps on both iOS and Android.

https://mobac.sourceforge.io

Anyway, if you would like to revisit using your iPad/iPhone, here are apps that I verified as working with Mobile Atlas Creator, the apps themselves probably offer maps that you can download and and use without the internet as well

Guru Maps
Map Plus
TwoNav
VectorialMap
OkMap
DiY MAP GPS

Mobile Atlas Creator should also be able to make maps for those other Android apps you have installed but are unable to purchase maps for.

There's also the HERE and TomTom apps for iOS devices. They have the option to download maps and use with no internet, but they're just for on-road navigation.

FWIW, the Guru Maps app for the iPhone also supports Apple CarPlay. Have been using it recently with my own maps installed on my phone - no internet connection needed and it lets me use my maps on the car's built-in screen.

Well, there are a lot of Android GPS apps, not sure if they would work on something as locked-down as a Garmin device however. And none of them really work with Garmin-format maps. Orux Maps attempts to open Garmin .img files, but the support was very poor when I tried it (long ago). It used some kind of open source library for displaying the files that basically converted them to raster-format maps on the fly. But you could check it out, there's an APK version

https://www.oruxmaps.com/cs/en/more/downloads

There are other map formats that work better with the app, see this

https://www.oruxmaps.com/cs/en/maps

Othewise, unfortunately, it sounds like you may have chosen the wrong GPS if you aren't happy with the maps that Garmin officially provides for it. I mean, if you want to use Android, you can get a pretty nice tablet for under $300 instead of Garmin's outrageous price! I got a 10" rugged Android tablet on Amazon from a Chinese company for around $200 to test a GPS app I'm working on myself, for example.

But just to confirm, have you tried copying the working .img files from your Astro to your computer, then copying them to the \Map folder on the Overlander? The "can't unlock maps" error message is bogus if you're using a free map of some kind, since they are not locked in the first place.

Happy to help, hope you're having a good holiday weekend as well! Let us know if this works for you, it might help someone else.

The Map folder needs to be in the root directory. IIRC, Garmin started doing this with the Nuvi 3xxx series sometime around 2009 and continued with the Drive series.I have several of these devices myself, the newest is a DriveTrack which I got around 5 years ago. It works fine with maps I've made myself.

This FAQ suggests that it can be done...

".IMG files must be located in a "Map" folder on the microSD card and/or the device for your device to display them."

https://support.garmin.com/en-US/?faq=wu1trGsT6C2hm8ZnKUmSu9

[Map]

Sounds like Garmin has done something strange with the Overlander. Too bad - but they've been trying to discourage third party maps for awhile across their products. I stopped making Garmin-format maps myself, just got tired of their closed system.

Anyway, you may have already thought of this, but have you tried making a folder named Map and putting your .img file(s) in it? IIRC, some newer automotive devices still recognize maps in the Garmin folder, but others require you to use the Map folder.

Was curious about this, did a quick search and found the following. They mention waypoints and tracks, but not maps.

https://support.garmin.com/en-US/?faq=5EX3AoGRsW6SE82Rylklb9

"BaseCamp™ software can also be used to manage waypoints and tracks, but Basecamp does not support route creation for the Tread devices."

Then there's this

https://support.garmin.com/en-US/?faq=21G3VnXffc3fvlt4Ru9Yg7

So, apparently it's possible but - if I understand this - you would need a compiled .img file that works directly on the device itself. Those are (generally speaking) not available from GPSFileDepot. Most of the maps here must be installed on your computer and sent to the GPS with MapInstall. Also found this, but it does not suggest compatibility with MapInstall

https://support.garmin.com/en-US/?faq=nhXr5UAzup3p4OrM4vsJn7

If MapInstall doesn't work, you could try installing the third party map on an old GPS (like your Nuvi) and copy the .img file from the /Map folder on that device (or /Garmin folder for older devices).