Do I really have to have a compass?

[flightlogic]

Thanks for the input from down under. Bet you are tired of the old sink drain topic. They do sell Southern Hemisphere compasses I noticed.
You are correct, the correction is for minor errors. Not my completely bassackwards vertical compass. Now that I know I can throw it out completely, I am free to play with it. Have always wondered how they work inside. Will be on my bench is pieces soon. I sold my wet SIRS compass here on the forum to a happy builder. The old real estate up on the vertical bar just may become the place I try my lift reserve indicator. Found a Minhelic pressure dif. Gauge on eBay. It even works just sticking it out the car window at 60. Imagine that.

[bruceg]

The deviation in my HSI and Airpath compass cards varied from 40 degrees on some headings to zero on some. Playing with the compensation screws didn’t help much. The flux valve for the HSI is mounted in the wingtip and checking that area with the iPhone compass gave weird readings around the aileron. A gauss meter showed the iron pipe aileron balance weight to be strongly magnetized. The roll bar and control stick were also magnetized. A degausser returned things to normal.