You do get access to more map layer when you pay for Gaia, unsure if you'd already done that or not.
Interesting on the DeLorme format, I had one of their GPS's 12 years ago and it was great other then the map format cause everyone else use the Garmin version. It was always a royal pain to convert and transfer back/forth.
I didn't pay for it because if it sucked I wouldn't be able to get my money back. It wasn't clear what layers they had, the only info I found was old comments from people that it was useless and they were pissed off they paid for it. It looks like it actually has a bunch of layers that may be somewhat useful, but really only the BRMB is useful for me.
Currently I got my ancient version of Orux to work and it displays the ancient version of BRMB. So it's perfect.
Well, maybe not, Orux is quite slow, but as long as you're not trying to scroll over a ton of area it's fine. Avenza won't run on this tablet, Android version is too old and it's hit EOL, but maybe if I could find an old version it would. I tried Osmand+ and removed it immediately, along with a bunch of other ones, because I couldn't figure out if I could actually load the .img I had into them even if I paid for them (you definitely couldn't without paying).
I don't know what BRMB does for updating their maps. My paper copies are quite old, 20 years I think. And the .img I have (which I bought used) is probably 10 years old now. I'd like to compare it to a current version but don't feel like spending the money to find out (it's $150 to buy it outright). I want it to show the old roads, and if they kick them out of the database once they're deactivated then it's useless. Being able to layer the old/new version would be the best option. That's assuming the updates are actually that significant.
I think I'm going to call it good for now because I have managed to make it work for what I want to do. Maybe when this tablet goes kaput I will update to something better.
Oh, Garmin Eathmate is kinda nifty now that I've been using it. But quite useless at the same time. Same with Explore. Why the fuck can't I put a Garmin .img into them as a layer? Or if there's some way to just insert it into the file system so it can be displayed, well, it's not at all obvious. It's like their whole ecosystem is a complete afterthought. Whatever, I can wander around with just the InReach and get it to track or put waypoints in, then it syncs to the tablet so I can rename them without having to type at 1 character per minute.