Okay, it was *really* cheap. And it shows. It scared me when I opened it, and it contains Li-ION battery, with "temperature" pin not connected. It does charge from USB, but don't try charging it from USB hub. It is actually usefull -- once it catches enough sattelites. And that takes *long* time :-(. Its lcd display can show sattelite status, X,Y,Z coordinates, speed and heading, and distance to waypoint. That's pretty much it. It does *not* display heading to waypoint (oops!) and while it contains a map, it does not put "here you are" arrow on the map, and even fails to scroll the map as you are moving... (AFAICT, it basically zooms map at random location). Making map unusable. Some screens fail to refresh (going from heading 350.34 to heading 0.12 displays 0.1234 :-), and if battery gets low, it will hang up and break in mysterious ways, instead of simply powering down.
If you switch to bluetooth mode, connect gpsd, switch to handheld, you see some "interesting" display corruption.
Version displayed is "0.5.1", and thats pretty much accurate "not yet done".
It is *really* small, and looks pretty fragile to me. More fragile than normal mobile phones... I wonder if I should create some protective cover.
OTOH it seems to work okay in bluetooth mode with linux. Good. And its LCD display is certainly better than 3 leds on most bluetooth GPSes. It has 5 key control (up, down, ok, esc, menu); control is too logical, but you can get used to it. (Entering waypoint names is "fun").
Billiontons product description
Okay, later I found out that if I keep it powered down while it can't reach sattelites, it actually tends to lock much faster and is almost getting usable.