How can I prove this if I haven’t been pulling out a compass regularly?
It would be evident if for example you had a compass with a declination adjustment that you set properly and used not too long ago. If OP's claim is true, the compass would be drifting out of adjustment within a matter of days.
Either that or there's some really powerful magnetic interference near OP's house. Or he's wearing steel-toed boots hahaha.
If you know your location, and have a visible peak on a topo map, you can identify the bearing to that peak, then sight for it. It will tell you drift since the map was created.
Thanks, I’ll try it. Just bought a land nav book and compass 2 weeks ago
Here's a cool site that has greoreferenced PDF versions of the old USGS quad maps.
https://data.fs.usda.gov/geodata/rastergateway/states-regions/states.php
Those would be great to use if you're just getting started with orienteering.
Let me know how it goes, I'm ashamed to say I don't have a good set anymore.
Very easy to validate. Ask an airplane mechanic. Runways are magnetically aligned (frequently rounded) and aviation compasses record the local magnetic variation which will cause the compass to deviate.
If this were occurring pilots and mechanics would be taking about it.
Use Google Map and align streets that normally run due N/S E/W. Most main streets in most cities are aligned this way.
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