Especially even basic stuff, I know Google Maps used to 'expire' offline maps every 30 days. Like, I have a 40 day old map and no service, but it won't tell me where to go (dunno if they still do that or not - ditched G Maps a long while back). Some more thought into "hey, what if people are offline" would be nice.
Edit: Also, shout out to paper too. I've got a bit of reference books (maps in my car, a copy if the survival medicine handbook at home, etc). Necessity might be the only way to get my Gen Z self to read a paper map, but could be handy to have.
Offline maps in Google Maps now expire after 1 year.
For communications, I've been looking into Meshtastic and Meshcore. I have no need for them right now and they're not very reliable for messaging (especially Meshtastic, Meshcore works better here in London, but their coverage isn't great), but clients are fairly cheap and you can get a network going in case something happens.
Parts of Portugal were affected by bad weather recently, with some areas losing power and eventually mobile networks. On a Portuguese group for mesh stuff, some people reported being able to send some messages where phones were down, so it doesn't hurt to have a few clients just in case.
Love to hear your opinions and further guidance on this matter.
Also, if the website is not available, it's because of another blackout :)