What error did you get?
@Michael sound like some help would be appreciated.
At the highest level, the map in OB1 is always my go to at first glance. We get about 10-20 new locations a day added by members and we verify the information is accurate before making that live. We also have tools for reporting inaccuracies so they can be corrected. Also, you can quickly tell the difference between unverified (gray) and verified (full color).
For the map message issue - in general OB1 will perform much better than the web, but web should work OK. I can help out if I get the platform (web. iOS, Android) and what happened. Now, it is quite a bit of data to send on a large group message, so internet connection should be solid. Usually at home on a desktop that's not an issue, but mobile it can be.
Glad to help further!