A night nav sessionWhile out with a few clients working on night nav one of them was really struggling, his pacing and timing were very accurate. Accurate, but it appeared that he was unable to reliably follow a bearing across moorland in the dark.
His compass had a couple of bubbles in it so I gave him one of my spares which I knew was accurate and we tried again, this time I walk next to him. Encouraged small sections, encourage rechecking his bearing, etc. He was doing everything right but consistently 20, /30 m away from his destination..
I checked with him, are you carrying your mobile phone close to your compass that will have an effect with the magnetism he reassured me. No, he wasn’t
His eyes then lit up. He was carrying small battery-powered hand warmers which also had quite powerful batteries inside of them. He had them in his chest pocket but when his hands were cold he was sliding them in his gloves and of course he was holding his compass with those same gloves.
Removing those hand warmers and putting them in his bag resolved all the problems and with that one action that man can now navigate accurately.
I learnt a lesson last night.
I had never imagined I needed to check for hand warmers!
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