Navigating With Compass And Map

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Get Your Bearings

Post by ThreeperMan on Tue 21 Jul 2009, 03:05

Get Your Bearings

Burt Gummer

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Navigating With Compass And Map

Post by ThreeperMan on Wed 15 Jul 2009, 15:30

Although technological advances and the use of GPS navigational systems have started to become the norm for outdoor adventurers, when you want to determine how to get from point A to point B, knowing how to find direction using a map and a compass is still a vital skill to learn for back up. However, in a survival situation, even if you have a map and compass with you, it’s often recommended that you stay put and wait for rescue to arrive as opposed to trying to reach safety yourself unless you’re absolutely sure what you’re attempting is achievable.

There are no hard and fast rules about what you should do in this regard. It’s likely to depend on a number of factors such as the weather, the terrain in which you are stranded, your navigational skills, the distance you are from safety, your food and water supplies and any injuries you or your party might be carrying, but knowing how to read a map and compass is a skill that might just come in handy.

In the UK, Ordnance Survey maps are your best bet. These not only show you the directions to and from places but also allow you to gauge distance and they show you the topography and features of the terrain as well as useful landmarks.

Using a Map and Compass
To enable you to navigate using a map, you also need a compass which has four cardinal points – north, south, east and west. However, something to bear in mind is that a compass never really points to ‘true’ north, except by coincidence in some locations, but its needle is attracted by ‘magnetic’ north which constantly fluctuates and varies in different places on the earth. So, when you’re reading north on a compass, what you’re really establishing is the direction of the magnetic north pole.

To take a compass bearing from a map you should draw a straight line on your map which passes through both your location point and your destination point and extend the line across any of the map borders. Then, you need to centre the compass where the line you’ve drawn intersects the map border and align the axis of the compass north-south or east-west with the border line. Then you can read the true bearing of the line you’ve drawn.

Some compasses are marked with the number of degrees in a circle, which makes sense given that the earth is a sphere so, remember that north = 0 degrees, east = 90, south = 180 and west = 270. Then, from where you are standing, set your compass so that north or ‘zero degrees’ aligns with your magnetic north needle, then take the magnetic bearing and start to follow this direction to reach your destination.

Using Magnetic Declination Maps
As stated however, true north and magnetic north are not the same, unless you have a compass that has a built-in magnetic declination adjustment. If you need more accuracy, you’ll have to consult a magnetic declination map for the geographic area you’re in to make the calculation adjustments you’ll need to make an accurate reading.

Factors to Watch Out For With Compasses
Because we’re talking about magnetic fields here, it’s important to remember that compasses can be affected by iron and steel objects so when you need to take an accurate reading, make sure the compass is not placed near pocket knives, belt buckles, railway tracks, overhead power lines etc.

However, all things aside, whilst a map and compass can help get you out from a survival situation safely, if you encounter a very dangerous and difficult survival scenario, your best bet would be to stay where you are, signal for help and wait to be rescued.

Thanks to http://www.thesurvivalexpert.co.uk/MapCompassNavigation.html

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