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Muskwa. He would have seen it from the vehicle as they drove past.
I'm pretty sure that you can't see Gilmour from the tower, only where it is.
Jeffrey if you're out there: The coordinates of the campsite on Muskwa are 46, 4.180N and 78, 27.134W. Sorry for the weird format but that's directly from the exif data. Photo is from 2012.
You're up Martin.