I could be wrong on this because I haven't tested it fully yet but you should be able to have each person logged into their own account on their own app. What they need is to bookmark a common map and have the write password for it. When they go to that bookmark and "unlock" the map they should be able to turn on the location tracking feature and begin recording their tracks.
matt on 31 Dec, 2018 09:14 PM
Adam is correct.
This is simplified with a team account (paid, $500/yr for volunteer organizations) since when you save a map to the team account it will automatically show up on all your members' phones as a writeable map, without needing to text out a map ID and password.