Hi 96902, The problem is you're using the wrong firmware... the firmware you currently have installed in your G90 is for a non-GPS device.
If using the correct firmware you will have a red GPS icon if no antenna is detected or no GPS lock is available or a turquoise icon showing the strength of the GPS signal.
GPs and non-GPS G90's use entirely different firmwares.
You can use a non-GPS firmware in your GPS G90 (as you currently have), but you'll loose any GPS functionality.
Don't use G90 + GPS firmware version G90-A770_553-S-H as it's very buggy.
Use the older G90 + GPS firmware version trunk r439M which is much better and perfectly stable (lacks time-lapse function).
P.S. You did buy a G90 + GPS and not retrofitted a GPS antenna to a standard G90 as the internal hardware is different.
P.P.S. I contacted Doreen at SZDome requesting the latest firmware (when I bricked my G90) and heard nothing back :-(
Why can't they just make the firmware downloads available from their website?
From your latest video you don't appear to be using the r439M firmware I suggested as I can see 0.0km being displayed.
The r439M doesn't display your speed on the screen or on the recording.
The GPS indictor is displayed in the bottom left corner of the display.
Grey = GPS antenna not connected.
Red = No GPS reception.
Turquoise = GPS reception (number of bars indicates GPS precision).
You have switched you GPS on in the settings?
Your audio does sound a little crackly.
Make sure everything is tight and no wiring is able to shake, vibrate or move.
P.S. Sorry for the awful picture :-/