PPRuNe Forums - Calibrating a compass using a GPS, in flight

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- - Calibrating a compass using a GPS, in flight (https://www.pprune.org/private-flying/443031-calibrating-compass-using-gps-flight.html)

24Carrot

18th February 2011 09:15

Quote:

We are talking about calibrating a compass in flight......

I think IO540 meant "under flight conditions".

I'll leave him to explain the benefits over the compass swing.:)

englishal

18th February 2011 09:23

Can't you just compare the HSI with the compass ;)

S-Works

18th February 2011 10:33

You could, but unless I am mistaken the HSI remote compass also requires swinging so it could be the blind leading the blind......

englishal

18th February 2011 11:43

Ahh, I see....We actually took one of the "swinging" compasses into the aeroplane with us when we were checking ours. I can borrow one if you need to use one....

david viewing

18th February 2011 13:13

I did this for real for 40 Hrs of long VFR xcountry in a plane (not my own) last year where the compass went AWOL, setting the DI every 10 min off the GPS allowing for percieved drift. After a while I forgot the compass even existed.

I think the typical GA compass provides an ideal platform for velcroing a standby GPS onto.

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