Friends System
Origins Mod features a friend system which allows you to invite/join other players which allows you to see each other in game and on the in game map. This useful when fighting in large groups to prevent accidental team kills.
The system is very easy to use, you will need a walkie-talkie in your tool belt, and also a map if you want to see players on it.
Adding Friends
To add players to your friends list, right-click the walkie talkie and select 'Friends List', then select the players you would like to send friend invitations to i.e. Player 3.