Mtd always used sp freqs. Identified as Mary units. The game and fish use that game and fish following a 2 digit Id number. I know they use to mostly use sheriff channels around southern part of state but started noticing them using sp dispatch as primary but use sheriff channels still for license and checks. Mostly around dona ana, eddy, otero, chaves and lea. Of course it's rxing from a 110 watt astro. So I'm hearing more then what a scanner would.
I have a document and map dated November of 2013 that shows about 1/3 of the officers have 3 digit unit designators. The highest number at that time was 159. I think the numbers refer to an officers badge number. It has been so long since I left New Mexico, now 33 years, that I don't recall. However, I did work with their officers in the Magdalena area while I worked for the Cibola National Forest and seem to recall the badge number matching the radio call of the officer I worked with the most often.
The dispatching was done by some center in Santa Fe. I seem to remember that when I hiked with them they called Santa Fe to advise they would be away from their vehicle for a period of time. They only had one antenna on their pickups and it was a long whip. I could listen to many remote bases from my home, Datil, La Mosca, one near the southwest side of the Plains of San Augustine, Sandia Crest and some others I don't remember.
There were 60 total sworn officers in 11/2013, with 19 of those holding the ranks of Sergeant, Captain, Major and headed by a Colonel. I wonder how many dispatchers it takes to handle their traffic? I assumed that Game and Fish, State Parks and State Forestry were in the same center, but it was difficult to get information about other agencies at that time. Maybe they cut some positions in Santa Fe and only have enough to cover nighttime.
I remember the remote base transmitted on 44.800 and mobile units transmitted on 44.920. There were no repeaters.