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The 500SE-M's 3D Compass acts very much like a standard Lensatic compass and in fact follow the same basic principles. For instance, when operating a compass equipped 500SE near metal objects, we should expect it to realize some deviation due to the introductions of new magnetic fields. The best situation is to operate free from outside metal objects or electrical interference, but we know that isn't easily the case during our missions. So what do we do?
1. Make sure the compass has been calibrated in a similar environment to the one our mission will occur. For example, if I plan to carry a weapon, then calibrate with the weapon across my back or lying nearby to optimize the compass for the environment you will operate in. Do not sanitize the environment, but instead practice sound shielding techniques to place your body between the compass and metal objects.
2. Before taking the picture, allow the compass a second or two to settle before relying on it's heading. Imagine the compass floating in white kerosene just like a Lensatic Compass.
3. Test your compass periodically so you understand the deviations it is realizing from your environment and then attempt to improve those conditions through removal or shielding and become aware of the deviations as a user.
I hope this helps. As always, I look forward to your comments.
-MK
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