Paralenz Vaquita comes with a built-in GPS antenna.
There are few things to remember:
1) When getting the first GPS fix on the camera, it's important to be outside, in an open space (not too many trees or buildings). It might take around 5-10 mins to get the GPS signal.
2) GPS does not travel underwater - so if you want the location to be set on your dive log, it's good to keep the camera (while turned on) above water, until the GPS is set.
3) GPS will not be found indoors.
If you have any troubles or questions, make sure to let us know at firstname.lastname@example.org