Yes most will work with each other. Our group has a combination of Multi-Sport Plus, FRS X1, & GMS X2 communicators and they all work fine togehter. Just have to change channels to get all syncd together.
From website: Chatterbox Radios, Channel Compatibility
FRS X2
· Channels 1:00 thru 7: 38, are the same GMRS X1 channels 1: 00 thru 7: 38.
· Works with all channels of hand held FRS radios.
GMRS X1
· Channels 1:00 thru 7: 38, are the same FRS X2.
· Channels 1:00 thru 7: 38, works with hand held FRS radios.
FRS Multi Sport
. Channel 1 ------- FRS X2 and GMRS X1 Channel 1. 00
· Channel 2 ------- FRS X2 Channel 8. 00
Only thing we have found is that the more sleds you get, the more interference (static). When we had 6, they worked great. When we ran 10 together, there was some static problems. Don't know if it was a new sled causing problem or if it was radios?
Would a Yamaha 4 stroke with all the electronics cause static problems?