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Non-compliant GDL90 Ownship report behavior

Open cyoung opened this issue 8 years ago • 3 comments

Ownship report not sent when GPS position fix not valid.

https://github.com/cyoung/stratux/blob/master/main/gen_gdl90.go#L287-L289

GDL90 "3.4" says:

The Ownship Report is output by the GDL 90 regardless of whether a valid GPS position fix is
available. If the ownship GPS position fix is invalid, the Latitude, Longitude, and NIC fields in
the Ownship Report all have the ZERO value. 

cyoung avatar Nov 15 '17 21:11 cyoung

Ref #348.

cyoung avatar Jan 17 '18 19:01 cyoung

Any estimate as when this will be addressed? I'm still hoping to be able to use my Stratux without a GPS. I don't need AHRS and I have a perfectly good GPS in the display device. What I do need is transmission of ownship pressure altitude.

Thanks

GitUser275 avatar Feb 11 '18 17:02 GitUser275

We now have EFB's that allow us to use Stratux in the UK - they now support GDL90. So thats good. However there is a problem with ownship pressure altitude reporting to a "free" EFB called EasyVFR - you can download it from the Appstore for your ithingy.

So the EFB reports a band of altitudes of a threat aircraft. They say they do this because no valid pressure altitude is received from Stratux and so they display a band of altitudes covering a range of 2200' (i.e low QNH - high QNH).

Is this the same problem reported here - or should I start a new thread ?

UKJohn avatar Apr 17 '18 14:04 UKJohn