Used the Geotagger Pro N2 (http://www.solmeta.com/product_pro.asp?pic_id=139) but did not like the fact that there is a USB cable attached and it comes out fairly easily. Service was good and I got a replacement cable (supposedly to fix the issue). Never tried it as it was sold by the time the cable replacement came.
Hi guys I have been using the Redhen Blue2Can with my D300 for a few years and just got the updated version for my D700.
With the updated version there is the GPS hold function, what it does is if your gps has no reception like indoors you can use the last good FIX before you went indoors for your exif till you cancel or stop it when you get reception again. It records Lat, Long, Alt and UTC. Check this out at