I know the park rangers carry Thales RACAL P25 radios. I was just there a couple weeks ago and had Close Call Running and found a 166.XXX using what sounded like P25. But since I have a BC-330T I couldn't listen.
FRS is also active and Channel 4 FRS is used for the geyser information at the main Geyser Basin.
W0JJK
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