Modem-M64 offers point to point communication to communicate between 2 modems. There are several parallel channels available, and it is possible to switch channels in use which allows communication between more than 2 modems, but not at the same time.
Modem A and B is configured to use channel 2
Modem C is configured to use channel 3
Modem A can now can communicate with Modem B (but not modem C).
If modem A now changes channel to channel 3 it can communicate with modem C (but not modem B).
Thank you very much for the quick reply. I have one more question. Could these be used with the Underwater GPS2 unit to act like the U1 locator and provide both communication and positioning? If not, do you guys have plans for a device that can act as both a modem and locator?