Xi5 remotes

How many remotes can be programmed to one xi5?

I'd like to know too, had this crazy idea about when you have 2 people on the boat and either can help steer it. I've yet to try it but know you can operate the foot control and remote that's what I do right now. Though the foot control is more as a backup incase the remote ever goes south.

found it on the motorguide webite
up to 4 remotes including the pedal