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RE: Prepper Navigation & My Traffic Light System!

in #preppers • 6 years ago

Some of the techniques you describe remind me of my Duke Of Edinburgh Award days walking across Dartmoor, looking for key points on the map and splitting the walk into sections and then trying to work out how long it should take to walk each section.

That was about 25 years ago and I have all but forgotten now how to navigate with a map and compass.

One question I have is, do compasses lose accuracy over time? I found an old Silva compass the other day and I think it might even have been the one I used all those years ago, the same question goes for old OS maps.

6 years ago in #preppers by
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     6 years ago 

    Your DofE techniques probably revolve around the initial planning of a Route Card (depicted above).
    As for Compasses:

    • They can actually reverse polarity over time, depending on their proximity to metals and magnetic fields.
    • Digital compasses can require re-calibration - I have found this especially in digital watch compasses.
    • In order to establish wether or not your compass is accurate, stand on a North/South road-orientate the map, and your compass on the map and check - Magnetic Variation will have to be considered!
    • I have never experienced a compass to lose its accuracy, but i suppose the strength of its magnetism can decrease, depending on its life exposure to external magnetic fields. They can also be re-magnetised if needed with a VERY strong magnet.
      Modern Maps will never lose their accuracy. Depending on where in the world you are will depend on the maps accuracy, as some countries base their mapping on ariel photographs. Personally i think the Ordnance Survey Maps of Great Britain are the best in the world... They are regularly updated and continually assessed for accuracy. Newer editions are produced according to new roads, tracks and buildings etc
      Hope i answered your question.
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