$15 for the Shoot RC-300 wireless remote from Ebay (check box 'Include Description'). Note: It has a Canon stereo mini jack plug connection.
$65 for the Ebay Yongnuo N-918/N1 GPS receiver to make this work. This has a wired RS-851 remote with it which uses the Canon type stereo mini jack plug.
But the Shoot RC-300 can be used as a wired remote, even with a flat battery. So I don't have to carry both but the cable is not as long as the RS-851. I got the GPS first then I gambled on the Canon Shoot RC-300 working on my D800. Cool.
"We don’t see things as they are, we see things as we are" - Anaïs Nin