Living Wild by Bear Grylls

Author:Bear Grylls
Language: eng
Format: epub
ISBN: 9781409081333
Publisher: Transworld

How to use a map and compass together

There are six basic skills you need to master when learning to use a map and compass together. To start with, they may seem complicated, but with practice they’ll become second nature.

* * *

HIDDEN DANGERS

It’s very important that you learn to understand and use magnetic variation. It might sound small, but for every 3° of variation that you forget to add on, you’ll be 50 metres off course for each kilometre you travel. When you’re trying to get to shelter or safety, the consequences of this can be very severe indeed.

The needle of a compass will always point to the strongest magnetic source it can detect. Nine times out of ten this will be the Earth’s magnetic field but, sometimes, local magnetic sources can skew the reading. These magnetic sources can be man-made (watches, underground pipes and railway lines can all have magnetic fields); or they can be natural (some rocks, for example, can be magnetic if they contain metallic ores). Take readings regularly, and if you suspect that something is affecting your reading, move position slightly and take a new one.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.