I have one I have made but the netcode isn't done. MH uses a funny HUD and extending it to include other things is tricky. I might work on that some this evening. I'd like to get that one finished.
Added after 3 hours 25 minutes:
Guys the radar is up on the Andromeda Cup server for testing. Let me know what you think. I purposely made it not "great" at seeing through a lot of walls as it made it too easy to see everything. I think this makes a nice addition though.
Also this WILL NOT see players or bots so don't bother ripping the code to try to make a cheat radar for DM.
EDIT- Small bug I found: If you leave midgame you wont get the radar till next map. It's spawning the radar at the start of the map, not correctly each time a person joins. If you dont see it, mapvote and it will show up. I'll work on the spawning issue tonight.