Sort of depends what type of function will suite him best. Some have basic gps ability paired with communication.
I don’t want to carry a gps and communicator so I have a Garmin 66i for the last couple years and really like it so far. It is a full capability gps (more than I need really) combined with inreach tech. Good screen size so it’s easy to use if you don’t want to carry a phone, or don’t want to have to rely on a phone.