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Silva 515, Instruction Manual, Page: 7 / 16

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7

• While still holding the compass, imagine a line extending exactly straight out from 

the sighting line. Your objective lies along that imaginary line.

DETERMINE DIRECTIONS WITH A SIGHT

Section C

T

o fulfill the two conditions described in Sect. A:

Set the dial according to Sect. A (1).

• Hold the compass at eye level and adjust the cover to a 50º—70º opening. The 

mirror should reflect a top view of the compass dial.

• While looking in the mirror, move your sighting eye sideways until you see the 

sighting line intersect one of the two luminous points.

• Without changing the relationship between compass and eye, pivot yourself and 

compass together until you see, in the mirror, that the orienting arrow is lined 
up with the magnetic needle and the red end of needle is between the orient-
ing points. This accomplishes Sect. A (2). Your direction or objective will now lie 
straight beyond the sight.

NOTE: Be sure to keep the base plate level so magnetic needle can turn freely. When 

sighting uphill or downhill, lower the sighting eye in relation to the compass.

NOTE:  A greater than 70º cover opening will increase the parallax effect and could 

cause as much as a 5º reading error.

Summary of Contents for 515

Page 1: ...A PRECISION INSTRUMENT DESIGNED FOR PROFESSIONAL USE INSTRUCTION MANUAL RANGER COMPASS model 515 ...

Page 2: ...e you with a working knowledge that you will be able to apply in almost any situation The illustrated 360 Degree Graduations are based on standard dial graduations of 360 degrees in 2º increments With this graduation North is 0º and increases clockwise so East is 90º South is 180º West is 270º and 360º is again North 0º and 360º are the same direction The Silva Ranger Model 515CLQ has Quadrant Gra...

Page 3: ...late black clinometer pointer magnetic needle with red north 2X magnifier scale in mm sight mirror sighting line index pointer orienting arrow with red north end meridian lines liquid filled capsule bezel with 2º graduations scale in inches ...

Page 4: ...cles with iron content a magnetic field can cause the red end of the needle to align with South a condition called reverse polarity Something as simple as being placed next to a pair of scissors or knife for a length of time microwaves high tension wires stereo speakers magnets etc can cause this problem A small bubble may form in the liquid compass but it has no influence on accuracy The appearan...

Page 5: ...oint down 4 Let one long side of the compass coincide with the slope of the terrain the inclination you wish to measure 5 Read the angle of inclination at the point of the clinometer needle Rules of Use Two separate sets of rules apply to the use of a magnetic compass One set applies if you work from map to terrain In this case you take map bearings In the fol lowing Sections A B C D and E deal wi...

Page 6: ...e magnetic needle and the red end of needle lies between the two orienting points When both conditions are fulfilled the desired direction is indicated by the sighting line or by the sight determine directions without the sight Section B To fulfill the two conditions described in Sect A Set dial according to Sect A 1 With the dial set open the cover wide and hold it waist high in front of you The ...

Page 7: ... see the sighting line intersect one of the two luminous points Without changing the relationship between compass and eye pivot yourself and compass together until you see in the mirror that the orienting arrow is lined up with the magnetic needle and the red end of needle is between the orient ing points This accomplishes Sect A 2 Your direction or objective will now lie straight beyond the sight...

Page 8: ...ion on the map turn the dial so the meridian lines of the compass are exactly parallel with any meridian North South line on the map and the letter N on top of the dial is toward North on the map Remove the compass from the map These two steps set your compass for the degree reading to your destination This reading may be read at the index pointer You fulfilled the first basic condition in Sect A ...

Page 9: ...9 declination map for North America ...

Page 10: ...sterly Declination In North America magnetic declination varies from 30º east in Alaska to 30º west in Labrador See diagram on page 9 Allow for Declination Where accuracy is not critical ignore magnetic declination especially in areas where the declination is minor You may also ignore it when the compass is used without reference to maps and is based on field bearings only When the compass is used...

Page 11: ...the compass dial housing one of which can be offset in relation to the other by means of a declination adjusting screw located on the underside of the base plate The orienting lines and the declination scale are engraved on one bottom The orienting arrow and the orienting points are on the other As you turn the adjusting screw you change the angle between the orienting lines and the orienting arro...

Page 12: ... is the direction or the degree reading from one object to another One of those objects is usually YOU To take a bearing means to DETERMINE the direction from one object to another 1 Bearings are taken from a map as in Sect D The bearing is the degree reading indicated at the index pointer 2 Bearings can be taken on the terrain by reversing the steps in Sect B and C When using the compass without ...

Page 13: ...dle red end between the orienting points The bearing to your object is now the degree reading indicated at the index pointer Adjust field bearings for declination Section G 1 The permanent adjustment for declination eliminates need for further adjust ment 2 To accomplish the temporary adjustment for field bearing declination Take a bearing as described in Sect F and observe the degree reading at t...

Page 14: ...d the orienting lines are also according to True North Draw your own orienting line according to Magnetic North On all topographic maps there is a declination diagram near the bottom The star line designates True North and is parallel with the orienting lines However the single barb arrow designates Magnetic North Draw your own Magnetic North orient ing lines by drawing 1 or 2 lines across the map...

Page 15: ...t ment Draw a line on the map along the edge of the compass intersecting the symbol You are somewhere along this line To establish your position along this line you need another bearing Take a bearing to the second site b and mark a line as you did with site a This line will intersect the first line Where the lines cross is your exact position BE EXPERT WITH MAP AND COMPASS Second Edition Björn Kj...

Page 16: ...r LLC 2009 p n 5793150C 2 09 Johnson Outdoors Gear LLC 625 Conklin Road Binghamton NY 13903 www silvausa com Johnson Outdoors Inc Canada 4180 Harvester Road Burlington Ontario Canada L7L 6B6 1 905 634 0023 Fax 1 800 661 1170 ...

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