Unit to Unit tracking

Heard and seen something like that in the amateur radio world, APRS http://www.aprs.org/
It involves transmitting GPS-locations to other units or to a central point.
Not many GPSses have an internal transmitter.
For the APRS systems I have seen, a GPS reciever was linked to an amateur radio transciever.
I quess It's not what you're looking for.

Sounds to me like some device that sends/receives NMEA to/from a GPS unit and receives/transmits it from/to others. I think APRS does the same thing.

No idea who make such a product but you should be to find something using Google.

Something like that yes.

The general idea is this:

A GPS output it's position using the NMEA protocol. Some device accepts that and transmits it (usually via radio).
Another device receives the signal(s) and sends that to it's attached GPS via the NMEA protocol. That unit can then display the position(s) (as waypoints) on its screen.

APRS uses amateur radio frequencies I think. It doesn't really matter what kind of radio is used (e.g. could be cell phones) but the specifics may matter for any particular application (are there many cell towers in the Baja peninsular?).

We are using these for 2000 mile cross country snowmobile races....

That's a pretty challenging application. Radio has range limitations that depends on many factors (frequency used, weather, ionosphere etc). Then you might have power considerations, cold weather etc.

My point is you'll have to consider many factors but as you said "I am not tech savvy".

In that case an APRS solution would probably work ok.

I know Kenwood radios are used for APRS applications. Google "Kenwood APRS GPS".