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I've done a lot of experimenting trying to perfect a GPS solution for when I travel.
Here's what I've found:
I don't like the all-in-one GPS solutions that are a GPS receiver plugging directly into the camera with no self-contained battery. I thought I would like this the best, since it's simple, but it's too slow to re-acquire. Either the GPS device needs to keep your camera awake to get power, or it needs to go to sleep in which case the GPS has to re-acquire a signal before the shot. It's fine if you're out shooting landscapes where you can wait for everything to sync up before taking a shot, but bad when shooting wildlife.
I also don't like the bulky solutions that take up the hotshoe. It's clunky, and between the hotshoe mounted receiver and the cable running to the data port, it tends to snag on things if I'm on the move and the camera is going in and out of my backpack.
The solution I have right now is a Foolography bluetooth adapter and a Qstarz BT-Q818XT GPS receiver. The Foolography adapter is tiny and low profile, and has excellent power saving decision making. The Qstarz GPS receiver has amazing battery life - literally double what most other solutions offer - and is speedy in re-acquiring signal even when it's sleeping.
I owned the Aokatec bluetooth adapter and the Holux M-1000 and they are both okay, and a LOT cheaper than the Foolography + Qstarz solution, so you can definitely save some money. The latter is a higher quality solution, though. Better power management, faster workflow.
Even so, I occasionally end up with a dropped Bluetooth connection or take the shot too quickly and lose the tag. I am considering switching to a GPS logger and just dealing with the extra step of synchronizing my tags, but I would also gain the advantage of my hikes being logged.
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