It lacks a little position accuracy but it's within the limits of what is needed to photo GPS tagging and sports tracking, however it may cause some trouble if used as a navigation device (together with another Bluetooth enabled device). Startup time depends on how much sky obstruction you have and if you are moving round too much, but once locked it didn't lost track so far (except when going into tunnels and such, of course). However there's an option to download A-GPS data to the device which will help it lock on the satellites much faster. Not sure how much faster or how much memory it needs, but I'd say it's worth it. As far as size goes, it's a little bigger than a usual keychain but still perfectly usable as one. It comes with bundled software for sports session management and photo tagging.
Overall I'd recommend it for photo tagging and sports tracking but wouldn't buy it with the main purpose of navigation. BT-Q1300S: Qstarz BT-Q1300S Nano Keychain Bluetooth GPS Data Logger (66 ch MTK, 200K waypoints, Dual Bluetooth/USB, Armband, Qsport Software)
I bought this to geotag my photos and also act as my phone's gps via bluetooth but it is so small I attached it to an RC plane, flew it around and found out how fast the plane goes, how high it went, takeoff and landing speed and where it went during the flight. Don't correct for drift on flights or it pretty much erases the whole path but other then making sure of that it just works no matter what you do with it from what I've used so far...highly recommended....fun toy. - Gps - Photography - Geotagging - Tracking'
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