Nikon’s GP-1 GPS Unit - Review
Using the Nikon GP-1 GPS unit, Geotags (Geodetic System WGS84) can be added to your images so you can record latitude, longitude, altitude and time information. This data should help you remember where you took that great shot!
Correlation between pictures and maps is supported by GPS function in conjunction with ViewNX version 1.2 software which is a free download and my Picturetown.
On a cold start, the Nikon GPS device takes 45 seconds to start communicating with the satellites. Otherwise, it takes about 5 seconds. Just know that the power for the Nikon GPS devices is sucked out from the camera so you can expect your battery to die out on you much earlier as I suspect that the GPS unit requires a lot of power to function (If you have had a different experience, please let us know and we will edit that sentence 
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Once connected to the camera, the GP-1 GPS Unit has three modes of indication to give you an idea of how accurate the GPS information is going to be:
* Red blinking (GPS data not recorded)
* Green blinking (GPS data recorded utilizing three satellites)
* Green solid(Four or more satellites detected, GPS data are more accurate)
The Nikon camera models compatible with the device are: D90 (via accessory terminal cable GP1-CA90), D3, D300, D700, D2Xs and D200 (via 10-pin remote terminal cable GP1-CA10). Some models may require an update to the latest version of firmware.
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I haven’t had any experience with the GP-1, but I have had experience in designing devices with GPS capabilities and modern GPS units do not use a lot of power (It will use a substantial amount less then the LCD). Sure the camera won’t last as long, but it shouldn’t be as bad as is implied in your article.