I had a QSO with an operator on Mt. Umunhum (W6/CC-052) from Black Mountain (W6/NC-150). The other operator didn’t know about SOTA. We exchanged information.
The General Rules say that the chaser “must make a QSO with the Summit Expedition” (Section 3.8 #2). The rules for a valid expedition in 3.7.1 don’t require that the operators are aware of SOTA.
I did not verify that the operator was not in a car and I did not verify that they were in the AZ (though I think all of the public area on Mt. Um is in the AZ). So, I don’t think I could log it.
But hypothetically, if I’d asked and the operator said he was on a trail and next to the radar building, would that be a valid chase? Because I might find him and send e-mail to verify if the S2S was good.
In other news, I spent 40 minutes calling CQ, with self-spotting, and got zero chases on 20, one on 40, and one contact on 2m. But it was a lovely day on the mountain.