The posts regarding bubbles at altitude have really caught my attention since "base camp" is at 6,000 ft. and the highest peak is 12,400 ft. I don't know yet whether we'll assail any of the mountains on our trek (selection info comes next month), but even just the base camp is higher than the altatudes that have casued problems in the past. I'd would be really ticked off if my compassed failed on the trail! (We'll have backups, plus my button compass in my PSK).

I'll take the time to see what the manufacture's comments will be if I ask about performance above 12,000 ft. And I'll look around at other compasses too.