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Perhaps an issue with Unicode text?

https://community.openstreetmap.org/t/cant-authenticate-maps-contact-seller-for-help/87406/2

I stopped making Garmin maps some time ago myself, and no longer even use Garmin devices, although I used them heavily at one time. It's pretty clear that Garmin doesn't want people to use third party (free) maps, they are desperately hanging on to a dying business model. But it would be surprising if they actively started blocking all third party maps.

I have read that (some) newer Garmin devices are blocking routable openstreetmap maps, presumably over liability concerns that the routing may be defective and cause problems. No idea if that is true, but if so then it might only affect routable maps.

Will admit, I'm a little out of touch with the current version of Birdseye. I have had several subscriptions, the most recent was for a DriveTrack automotive unit. But Garmin has killed all of these older devices and no longer supports Birdseye on them. I think that happened about 4 years after I purchased. The newer Birdseye is directly downloaded on the device somehow (I guess) and it might be different.

However, there actually was a way to disable some of the Birdseye in the old version, but don't think it will help you. There were separate Birdseye products, like satellite imagery and topo maps. Those were separate subscriptions and showed up separately on the maps menu, so they could be turned on and off.

But you couldn't enable/disable individual .jnx files within each subscription.

AFAIK, Birdseye is an "all or nothing" proposition...

"Custom maps" has different meanings. On this site, the owner likes to use it to describe any map that doesn't come from Garmin. Garmin has a different definition though, it's a special kind of map you can make yourself from aerial imagery or scanned paper maps. These are .kmz files, not .img files however.

What is the source of your .img file? Is it a file from a GPS unit? .img files are "containers" and Garmin puts different things into them which require different treatment.

If it's a file from a GPS, then you can't "install" it in Basecamp, but Basecamp will recognize it on a GPS that is connected to your computer. Likewise, you could create a Garmin folder at the root level of a USB flash drive or SD card and copy the .img file there. Basecamp will treat that the same as if it were a GPS. See this for another way to do this without a flash drive.

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

Now, some people distributed their Garmin maps as individual .img files many years ago on this site. These are completely different, this tutorial explains how to use them

https://www.gpsfiledepot.com/tutorials/how-to-load-.img-files-into-mapsource-with-mapsettoolkit/

Happy to help. Since you're using a Mac, you could also use a "virtual device" for this instead of a physical flash drive. See this:

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

On that site you will find a number of very useful free apps. They're written in Java, which makes them compatible with Macs and Windows machines. Don't recall the details, but some of them may no longer work because of changes to MacOS however, I think you'll find some discussion of that on his site.

Is this the map you're trying to use?

https://www.gpsfiledepot.com/maps/view/1/

Garmin has some instructions for installing third party maps here

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

I don't have a Tread and have stopped using Garmin devices completely now, I think Garmin is living in the past and their devices are not a good value today. But that's beside the point, of course.

Anyway, that support document assumes you already have an .img file in the correct format and it simply tells you how to copy it to the GPS. The trick will be creating the .img file in the first place. You could try this: plug a USB flash drive into your Mac, not sure if it's necessary, but the first thing I would do is format it as FAT-32, which is what Garmin uses.

Open the Disk Utility app, you will find it in the Utilities folder which is inside the Applications folder on your Mac. On the left side of the window you should find a listing for your flash drive. Click on that, then click the Erase button at the top of the window. IMPORTANT - make sure you have really chosen the USB flash drive and not another disk on your Mac! Also note that you must use a flash drive and NOT a hard disk or SSD for this.

Disk Utility should then ask if you want to erase the flash drive. Click the Format menu and choose the MS-DOS (FAT) option, then click Erase.

You should now be able to use Garmin MapInstall to put the map on your USB flash drive. Garmin's software will think that your flash drive is actually a GPS and treat it accordingly. Follow our tutorial here. Note: Garmin MapInstall is part of the Basecamp software, but some people report that the App Store version doesn't include it. If you don't see this app in your Applications folder, use the link in the tutorial to download it directly from Garmin

https://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/#mac

If all of this works, you should now have a folder named Garmin on the flash drive and there will be an .img file inside that folder which is the map.

At this point, you can use the instructions in the Garmin link I posted above to create a folder named Map on Tread GPS, then copy the .img file to it.

Sound complicated? Yeah, it is. And, getting back to your original post, apparently this map doesn't have the trails you want on it anyway. You could try installing some other maps from this site in that case.

Maybe somebody else will have some suggestions, but I wouldn't count on it. This site is pretty dead now. As a moderator, it pains me to say this, but it's mostly just spammers that post here, I delete their posts and ban them all day long.

As I've suggested to others, you might try another site such as this.

https://advrider.com/f/

But (IMO) the sun is slowly setting on Garmin's expensive, proprietary devices and forums like ours - which used to be so interesting and helpful - are all but dead. 

It's unfortunate, but I don't think you will get a lot of help here. Most of the people who come to gpsfiledepot these days are just spammers that I ban from the site. There's an occasional post by somebody who needs help with the maps here, but that's about it. Sites where people discuss GPS devices have mostly all gone away, killed by the smartphone. I was a moderator at GPSReview for many years, which would have been a good place for your question. Then one day the site was just gone, apparently, the company who owned the site simply "pulled the plug" wiithout even telling the staff.

Let's see if you get any answers. In the meantime, you might get more help at a site like this

https://advrider.com/f/

Assuming you're talking about this map?

https://www.gpsfiledepot.com/maps/view/831/

Works fine for me on the Mac with Safari. Does not work with Chrome - nothing happens, no error message. See this thread for a Chrome work-around if you prefer it

https://forums.gpsfiledepot.com/index.php/topic,5318.0.html

IIRC, the GPSMap 64 series has been discontinued. For satellite imagery, you would have needed a Birdseye subscription, but as discussed above, Garmin has discontinued Birdseye for these older devices.

So, I really don't think there are any options for satellite imagery on your device unless you make them yourself. If you do, they will be very limited in terms of how large an area you can cover. But here are Garmin's instructions for making simple maps of this type

https://support.garmin.com/en-US/?faq=cVuMqGHWaM7wTFWMkPNLN9

Also see this thread. I have not used this myself and don't know how well it works.

https://forums.gpsfiledepot.com/index.php/topic,5086.0.html

The answer is not good (I have an old Montana 600 myself). It used to be that you could create your own Birdseye imagery with third party software, but you had to "trick" Garmin into thinking it was "real" Birdseye. This was easy to do, as long as you had an active Birdseye subscription from Garmin.

But now the problem is... you can't get a subscription from Garmin, so even if you create your own imagery you will not be able to authorize it because that depended on Garmin's servers.

You can still make Garmin "Custom Maps", which are .kmz files that can be created directly with Google Earth for small projects or with special software for somewhat larger ones. This could be a big job for someone who is not familiar with making maps however.

But - putting that aside - Garmin only supports small maps of this type, presumably because they didn't want it to compete with their own Birdseye. The Montana can accept a maximum of 600 .kmz image tiles, and each can be no larger than 1024 x 1024 pixels.

So - it depends on how high you want the resolution to be. For very high res imagery at 1 foot/pixel, each of those tiles would be 1024 x 1024 feet. A block of 5 x 5 tiles would be about equal to one square mile. Do the math... that's 25 tiles per square mile which would give you a total of 24 square miles coverage for the 600 tile limit (an area 6 miles x 4 miles, for example).

If you use lower resolution imagery, you could cover more area. But it's still very limited and only suitable for mapping small areas. The other problem is that this kind of map performs very slowly on the gps.

You will find some existing maps in this format here at GPSfileDepot, but not a lot. Go to the map page here and check the box at the top that says "Garmin Custom" then click the Filter button. That will give you a list of everything available, including several of my own that I made many years ago when Garmin first introduced this kind of map.

https://www.gpsfiledepot.com/maps/state/all

Aside from that... yeah, Garmin really extended the middle finger to everyone who owns one of these expensive older devices when they discontinued Birdseye.

Select Copy Link

Open new tab

Paste into the address bar of new tab

Cool - that works!    I had tried just right-clicking the "here" link but that didn't work. However, copying/pasting into the address bar does work.

Yeah, I can't get it to work with Chrome either. Sorry, I have no control over such things, I'm just a moderator for the forums. The site owner would have fix that and unfortunately he's not around much.

You could post about it here, but realistically, I'd just use Safari since it works and it's not likely that the site will be updated anytime soon.

https://forums.gpsfiledepot.com/index.php/board,3.0.html

Sorry you're having trouble, but it must be on your end. Just downloaded all of the links that you posted, it was very fast, each one took less than a minute.

Since these are Mac versions, were you using a Mac? I used Safari on MacOS Monterey here with no problems. However, just tried downloading that first Map with Chrome on the same Mac and nothing happened. Then I tried the same download with Microsoft Edge on the same Mac and got an error that it "couldn't be downloaded securely".

Not sure what's going on, but try using Safari on the Mac.

and the mapmaker, popej seems by all accounts a good guy

Good guy? Popej is a legend when it comes to Garmin maps and software! 

Not familiar with that map, it appears to be hosted on another site. Where did you get it and did it include any info about installation? Do you only have one .img file? If so, it might be a file that is ready to use directly on a gps. What is the filename? If it's gmapsupp.img, then that's what you have, it could be copied directly to the Garmin folder on your GPS or memory card. That kind of file will not be directly compatible with Basecamp however.

Otherwise, the .typ file should be optional in Mapsetoolkit. If not present, the default styles will be used. But you need to give us a little more info.