Silva ALPHA 4 Bedienungsanleitung PDF herunterladen (Seite 43)

NAVIGATION

EXPEDITION S

Art. No. 36827-1001

Art. No. 36827-1003 (ME)

Art. No. 36827-1005 (MS)

Magnetic Declination

When compass and map are used to-

gether it’s important to know the local

magnetic declination (i.e. the difference

between true North—where the map

meridians point—and magnetic North—

where the compass needle points). In ar-

eas with significant declination, adjust-

ments must be made to walk a correct

bearing; information concerning mag-

netic declination is found on the topo-

graphic map.

Positioning with Cross-bearings

It’s simple to plot a compass bearing onto

a map by following the Silva 1-2-3 System

in reverse order. Take a bearing to an ob-

ject in the field that you can also locate on

the map. Place the compass on the map

with the baseplate’s long side intersecting

the object to which the bearing was taken.

Draw a line along the baseplate, and your

position is somewhere along this line. Re-

peat the procedure using another object

that you can see from your current loca-

tion and you’ll be at the intersection of the

two lines. For best accuracy, use objects

that are on a 90-degree angle from each

other versus your location. For even great-

er accuracy, use three lines.

GPS Coordinate Scales

Use the GPS coordinate scales on the

base plate to determine the coordinates of

a known position on the map (or to deter-

mine the position of known coordinates on

the map).

Hints & Tips

Silva Expedition S features easy-handling Dryflex™

housing, silicon rubber feet for precision map work,

detachable safety-release lanyards, night-enabling

luminous markings, magnifying lens, map-measuring

scales in mm or inches, 1:25,000, 1:50,000 and GPS

scales, plus built-in adjusters for magnetic declination

(including permanent local adjustment). The Expedition

S can also map-measure 1:40,000, has both a clinometer

for measuring slope angle, and 45-degree angle

assistance on the mirror-sighting function.

Silva WB 2012.indb 43 2011-09-19 15:28

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