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Silva 1-2-3 System

2. Rotate the compass housing until N on the dial

points North on the map. Check that the compass

housing red/black north/south lines are parallel

with the maps meridians.

NB! If using a mirror-sighting compass – angle

the mirror/lid approx. 45 degrees towards yourself

and hold it with straight-arm in front of you. Now,

at the same time looking in the mirror to see that

the compass needle aligns with the red/black

N/S arrow, sight above the mirror (using the sight)

towards an object in the eld in line with the

direction of travel.

3. Hold the compass in your hand and turn

yourself until the red end of the compass needle

(North) coincides with the red arrow in the bottom

of the compass housing. The front of the compass

with the direction of travel arrow is now pointing

towards your destination.

1. Place the compass on the map with the edge

of the compass along the desired line of travel.

I know my position on the map and would like to go to a lake in the forest,

which I see on the map – how do I do?

The easiest way to set a compass course towards the lake is to use the Silva 1-2-3

System©. It is a simple and safe system used by navigators such as expeditions,

youth organisations, mountain-guides, armies, orienteers etc all over the world and

it is the main reason for Silva’s market leading position.

Guide to compasses

Does my compass work anywhere in the World?

Yes, the only thing you might consider is the fact that the compass needle can dip/

tilt if you travel far north or south from the area in which you bought the compass

(and for which area it is intended to be used). Normally this does not affect the

accuracy, but for world wide travellers we recommend the Voyager series, which

due to its construction/balancing of the needle can be used in most areas without

affecting its performance.

Why does my compass show the wrong direction?

Because of deviation, the deection of the compass needle from Magnetic North,

by a magnetic eld other than the earth’s magnetic eld.

One must always be aware that this can happen. Magnetic elds exist near

knives, scissors, electronic instruments including mobile phones, radios, metal

fences, tins, some rings and watches, binoculars(especially the hinge screw) and

vehicles. When using your compass – try to stay clear of strong magnetic elds for

the best accuracy.

How do I make sure that I care for my compass in the best possible way?

Try to store your compass away from extremely strong magnetic elds such as

strong magnets, loudspeakers, etc which in extreme cases can demagnetise the

compass needle. Avoid giving compasses hard knocks, and if needed, clean the

compass in fresh water. Also avoid exposing the compass to extreme temperatures

above +50 degrees Celsius.

What shall I think about before leaving home?

Check the polarity of the needle, the general condition of the compass and that the

compass functions correctly, so that you can be sure that you get the most out of

your compass from Silva.

What is magnetic declination (variation)?

Magnetic declination is the difference in degrees, between Geographic North

(to which the maps meridians are directed) and Magnetic North (to where the

compass needle is pointing). It varies, depending on where you are in the world

and can be found on most maps. Eastern declination means that you shall subtract

the amount of the declination from the bearing obtained from the map to get a

true compass course. Western declination means naturally that you should add

the declination to the bearing. With some Silva compasses (such as model Ranger

15 TDCL, Expedition 25 TDCL-E or the Voyager series) you can compensate for the

declination.

Learn more about the Silva

use by watching the movies at

www.silva.se

Magnetic declination

1 2 3 4 5 6 7 8 9 10 11 12

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Brunton Multi-Navigator Manual de servicio Pagina 9

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