Airpath compass correction instructions.

[PA1195]

Are runway headings less-same-more accurate than a GPS with current database? I bet less.

Gary

[Ragwing nut]

As long as the compass points the general direction I'm going, I will be fine. Its not like they sit very still anyways unless you have a vertical card. I have flown from OK to FL in a tcraft with nothing more than a pile of maps and a handheld icom radio. Anytime radio work is done, the radio shop should calibrate the compass. Problem is alot of the airports don't seem to have a compass rose anymore.

[PA1195]

The SIRS compass model and vertical card compasses work better. I've had them and they seem stable and easier to read once calibrated.

Gary

[astjp2]

I have removed 3 vertical compass card compasses for failures and an airpath put in, regular airpaths get removed and repaired and put back in...

[PA1195]

I had two VCard compasses that survived but were in airplanes that had a propeller balance done. Anything mechanical like them can surely wear and fail exposed to excessive vibration. My SIRS compass (https://www.sirs.co.uk/aircraft) appeared to work well in my Cub and has good reviews by others for its ability to be compensated.

Gary

[Robert Lees]

Are runway headings less-same-more accurate than a GPS with current database? I bet less.

Gary

Magnetic north is moving towards Siberia faster than anticipated. NOAA (USA) and BGS (UK) www.bgs.ac.uk have been monitoring the shift in the iron core of the Earth. The World Magnetic Model (WMM) is being changed, forcing airfields to re-paint runway markings earlier than anticipated.