Summary: First and foremost- many people have talked about the battery life of your camera being affected- I can't tell a difference. I took about 1800 shots on my D-90 before the battery was down to 24% (battery is about 6 months old). The GPS is very accurate, when it gets a signal. In my experience, if you have a clear view of the Southern sky, it will lock in about 45 seconds if you have traveled a great distance since its last power-up, otherwise, 5-10.
Summary: Purchased the GP-1 to help organize photos with the "Places" feature in iPhoto. I've used the product for three weeks and used it on a cruise ship and while touring Bermuda, both on land and ferries. I am very pleased with it. I would have given the unit 5 stars but the interface on the D90 is a problem. Although I list more Cons than Pros, the GPS works great and gets the job done.
Review the Eye-Fi Memory card before buying this product.
Steven C. Quarles, Amazon
26 April 2010
Summary: This product has been on my wish list for some time however after reviewing the Eye-Fi wireless memory card that offers geotagging I have reconsidered my purchase. I have not been able to use the Eye-Fi wireless memory card myself but when I saw that it offered geotagging it gave me an additional option to consider. Especially after I realized this device takes up the space of my shoe preventing me from having my flash attached to my camera at the same time.
Summary: This is really cool, provided you actually read the directions. For this to work reliably, you need to change a default setting on your camera. If you do not read the manual, you would not know this and therefore be disappointed. I am impressed how quickly, even when the signal is attenuated by trees or inside a building, it access satellites ad determines position. This is really great!!!
Summary: Although a bit pricey, this unit allows for gps tagging of your photos. It sometimes takes a while to acquire enough satellites for a clean fix, but otherwise, it gets the job done. The unit can also be attached to your computer for gps mapping (works in Windows and Linux).
Summary: This is an inexcusably crappy piece of equipment from Nikon. The negative reviews are quite right - the unit takes for ever to sync with a satellite signal and ONLY in totally unobstructed areas, which makes it useless for 90% of the photography I do here in the Pacific Northwest. And right again, you don't dare turn off the camera or your in for a long wait while the unit re-synchs and your battery power dwindles. This is an expensive piece of Nikon junk.
Summary: I've had my GP-1 for almost a year now, and recently got my D90 body back from the repair shop due to a problem from the GP-1 attachment. The cable that connects the GP-1 to the camera is very poorly designed - it over stresses the connection jack where it attaches to the camera. After several months of use (not very heavy use, either), the connection became intermittent then finally failed.