enough but many people do not know as it is correct to use such banal (and extremely necessary) a thing as the card.
Orientation according to the card
The card serves for determination of your location and to understand where you …
Oh yes forgot to tell that there is nobody nearby and all means of communication do not work therefore you should not screw up with the only assistant – the card.
To understand where you, you should put the card horizontally and having put on it a compass to rotate the card (together with a compass) until the arrow of a compass on coincides with meridian.
As the directions of a magnetic needle not ideally coincides with the direction on a geographical pole, distinguish two meridians – magnetic and true, and the difference sometimes reaches a deviation at 10-20 ° and more in different directions.
Accounting of magnetic inducement
The local deviation can be specified on the card, but it happens not always. It can also be determined by the Pole star, or local magnetic anomalies if such are specified on the card.
If the deviation east, on cards it is signed by plus (+8 for example). Such record means that the true North to the left from the direction of the northern end of a magnetic needle at the set size (in our case on 8). It follows from this that we should turn our compass so the northern end of an arrow would coincide with the instruction on a limb 8 °. In that case the axis of a limb of S-Yu will pass through a true geographical meridian, and our compass will turn out directly focused in relation to sides of the horizon. In case there is a sign - of action it is necessary to do taking into account the fact that the North lies from the northern end of an arrow to the right.
Determination of the location
After you oriented in the card, she should be tied to the area. It is necessary to make it by vising on noticeable objects, or by means of our compass. Here that to be necessary for us knowledge of an azimuth which we will get from the following articles.