/ Reverse polarity on a Compass
even stranger was the fact that his compass kept true but later in the day his switched and mine then returned to its normally position.
this caused us some problems the following day when the weather closed in quickly , as we left Great End , visibility was very poor and not able to
see any land features we took out our map and compasses both showing opposite readings for North. they were nt stored together but in separate packs
we did consider they may be affecting each other but the first time this happened, mine was the only compass we were using .
also considered was the affect of magnetic elements in the rock is this an issue in that area ?
i ve been hillwalking for a good number of years and never encoutered this before
has anyone else had this happened ? or more importantly know the reasons for this and if possible preventions
as for the effects of gadgets
we both had cameras but , i regularly take one and its never been a problem
any suggestions most welcome !
Yes, had this happen to me a couple of years ago on the top of the Glyders in awful weather and ended up on Glyder Fawr instead of Fach. I put it down (afterwards) to having my sister's camara in my pocket as the compass corrected itself later. The camara had a rechargable internal battery rather than disposable ones.
Good to know.
Also, ice axes...I'm told mobile phones can affect them too
You're probably carrying a magnet you're not aware of.
Silva offer a free re-magnetising service if you post it off to Switzerland however as the bezel on my spare had seized solid I don't have time to get that done!
It doesn't have to be the batteries either. My Olympus Tough Camera (metal casing) has a huge affect on a compass if in close proximity (less than 6"). once I spotted this I checked some other items I carry and found GPS also caused the compass to deviate, as did my mobile phone, but all needed to be within inches of the compass. The camera was by far the worst though.
If your worried that its something your carrying, then look for consistency - it should happen every time more or less.
This is my understanding of the area too.
i think any of your suggestions could have been the culprit or maybe a combination of them all.
ill certainly be more on the ball in future and try to pack more considerately making sure the compass(es)are stowed well away from any potential magnetic sources .
many thanks and keep safe on the hill !
though I believe , or have been told, that so many of the ferrous parts have now been stolen as souvenirs (it's a war grave) that all that is left these days is aluminimum so maybe it doesn't do it anymore.
> It doesn't have to be the batteries either. My Olympus Tough Camera (metal casing) has a huge affect on a compass if in close proximity (less than 6"). once I spotted this I checked some other items I carry and found GPS also caused the compass to deviate, as did my mobile phone, but all needed to be within inches of the compass. The camera was by far the worst though.
> If your worried that its something your carrying, then look for consistency - it should happen every time more or less.
That is exactly the same camera as I was carrying. I won't be making the same mistake again!
I simply carry a bottle of tippex and a red marker pen, which allows me to easily modify the compass needle in the event the polarity reverses..
You win this week's Top Tip!
Alternatively, draw a compass needle on your hand while facing north, then it can't possibly reverse polarity. Job done!
Damn you Pero, you've thwarted my brilliant invention!
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