Why would a scuba diver care about having GPS on a dive computer? GPS doesn't work underwater, so it's completely useless for navigating during the dive. Boats typically have their own nav system which is better than anything mounted on someone's wrist. Is the point to to have the GPS coordinates at the surface when you started and ended the dive? You could just write them down once for each site. If you dive the site again, they will be the same... I specifically would NOT want the additional battery drain associated to the dive computer operating a useless GPS antenna. A much more useful feature for a dive computer, IMHO, is good dive planning software, so e.g. if you've already done two deep dives, you can plan a third NDL dive using the computer's data, the precise gases and profile you dove, and a reasonable decompression model such as Buhlmann ZHL-16C GF.