Carbon Canary Posted October 8, 2023 Share Posted October 8, 2023 Australia has some very large deposits of magnetite ore, close to the surface, predominantly in WA but also in Tasmania. I haven’t heard anyone mention any impact on a compass, when flying below 10,000’, but does it ? 1 Link to comment Share on other sites More sharing options...
facthunter Posted October 8, 2023 Share Posted October 8, 2023 I don't recall it being significant to the ordinary compass. Called declination (variation). Where its a certain value, it's called "Isogonal" lines. Nev 1 Link to comment Share on other sites More sharing options...
Carbon Canary Posted October 8, 2023 Author Share Posted October 8, 2023 on further research, it apparently does happen- particularly to inbuilt magnetometers that are routinely installed in EFIS. https://www.aviationsafetymagazine.com/features/when-magnetometers-and-compasses-go-bad/ 1 Link to comment Share on other sites More sharing options...
spacesailor Posted October 8, 2023 Share Posted October 8, 2023 Interesting read !. Were did all these mysterious anomalies come from so suddenly ! . AND if only small , on a longish flight , wouldn't it cancel itself out after passing the anomaly. spacesailor Link to comment Share on other sites More sharing options...
Jabiru7252 Posted October 8, 2023 Share Posted October 8, 2023 I think any interference to compass readings caused by flying near magnetite deposits would be small compared to the normal compass swing we experience from turbulence etc. Gee, trying to navigate using just the compass in a Jabiru on a hot day was a challenge. (I miss the directional gyro from my GA days). 1 Link to comment Share on other sites More sharing options...
Old Koreelah Posted October 8, 2023 Share Posted October 8, 2023 There is one very prominant anomaly you blokes should definitely steer clear of while flying: 1 Link to comment Share on other sites More sharing options...
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