Originally posted by gifthorse Having the flash mount free would be an advantage sometimes but will using the camera battery power the GPS be helpful, particularly since astro uses long exposures? In other words, isn't the built-in GPS consuming battery power that could be used for a few extra shots? Either way, the Pentax astrotracer function is a feature that sold me on the Pentax brand. On the plus side for the K3ii, the O-GPS won't snag and get torn off by a moment's inattention.
And you won't keep popping the flash open while hiking...
I think the GPS can be turned on and off, so it's not a constant drain.