Wooo got on board GPS working.
After getting a second X800, I now have managed to get valid GPS strings from the device on COM7 which is a tad confusing as this is not mentioned anywhere in the settings - all options point to COM2 or COM4 for on board GPS integration. This was doable after I performed a hard reset of the device - beforehand I got nothing. I have found the updates to be much slower than my dedicated bluetooth GPS receiver, but shall test it out to see how accurate it is and if it is fast enough for a moving object!
Time to hard reset the other device and see if I get the same joy!
More to report soon!