Sorry guys. Forget about the second question.
That was a momentary lapse of reason on my side.
Of course as a standard you cannot have 19k2 Baud Rx and 4k8 Baud Tx on the same serial interface.
But the fact remains that the LNAV needs 4k8 Baud.

In my case, with the IPAQ310, that would only leave the BlueTooth interface, as the hardwired interface is already used for the PowerFlarm.
This would require a KT6BT interface (at US$200) or similar.
As Max says on this webpages: far too expensive for my taste. (http://max.kellermann.name/blog/k6_b...ls_vfbt_1.html)

3U