Javascript required
Skip to content Skip to sidebar Skip to footer
Home / How to Set Declination on a Silva Compass

How to Set Declination on a Silva Compass

  • Contents
  • Table of Contents
  • Bookmarks

Quick Links

RANGER COMPASS

model: 515

A PRECISION INSTRUMENT

DESIGNED FOR

PROFESSIONAL USE.

INSTRUCTION MANUAL

loading

  Related Manuals for Silva 515

  Summary of Contents for Silva 515

  • Page 1 RANGER COMPASS model: 515 A PRECISION INSTRUMENT DESIGNED FOR PROFESSIONAL USE. INSTRUCTION MANUAL...
  • Page 2 Your Silva Ranger is finely crafted to withstand rigors associated with the out- door professions. It is a rugged, durable piece of equipment that, with proper care, will remain dependable and accurate.
  • Page 3 sight compass cover mirror luminous points sighting line base plate black clinometer index pointer pointer orienting arrow with red north end magnetic needle with meridian lines red north liquid filled capsule 2X magnifier bezel with 2º graduations scale in mm scale in inches...
  • Page 4 GENERAL SUGGESTIONS our Silva Ranger compass may be used for finding directions with or without the aid of the sighting mirror. LEARN BOTH WAYS. 1. When extreme accuracy required: With the sighting mirror, hold compass at eye level with cover opened to an acute angle.
  • Page 5 THE CLINOMETER he SILVA Ranger compasses are practical instruments for measuring angles of inclination. The long side of the compass coincides with the slope of the terrain. Measure an angle of inclination in the following way: 1. Open the lid completely.
  • Page 6 BASIC CONDITIONS TO DETERMINE FIELD DIRECTIONS Section A o use the compass to indicate directions in the field, two basic conditions must always be accomplished. These are: 1. The dial must be set to the desired degree reading. If the degree or direction is known, turn the dial to the correct reading at the index pointer.
  • Page 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 o fulfill the two conditions described in Sect. A: Set the dial according to Sect.

  • Page 8: About Declination

    OBTAIN A BEARING FROM A MAP Section D e state in Sect. A, that one of the two conditions for using the Silva Ranger is to set the dial at the desired degree reading. If this degree or bearing is not known, it can be determined from a map.
  • Page 9 declination map for North America...
  • Page 10 agnetic declination is the angle between True North and Magnetic North. The amount of declination at any given point depends on the location of that point on the continent. Where True and Magnetic North are in the same direction, the dec- lination is zero.
  • Page 11 Turn the dial to increase or decrease that reading according to the declination. Easterly, decrease the dial reading and westerly, increase the reading. For example, if your bearing from the map is l00º and the declination is 10º East, DECREASE the reading 10º by turning the dial to 90º. If the declination is 10º West, INCREASE the reading of l00º...
  • Page 12 NOTE: The declination offsetting mechanism is set at zero at the factory. Use the zero setting for all compass operations which involve no allowance for declination or in which the temporary allowance is being used. If the declination scale does not read zero, set it to zero with the adjusting screw.
  • Page 13 the red end of needle lying between the two orienting points. The "bearing" to your object is now the degree reading indicated at the index pointer. 3. Bearings can be taken by using the sight. Hold the compass at eye level and adjust cover so top of the dial is seen in mirror.
  • Page 14 NOTE: The instructions for a "temporary" adjustment for declination of a field bear- ing are exactly opposite from the temporary adjustment of a map bearing. NOTE: The declination scale should be set at zero for all compass operations which involve no allowance for declination; or when the temporary method is used. A "Short-Cut"...
  • Page 15 Adjust your compass for the declination of your area by the permanent method. Take a bearing to the first site (a)— without disturbing the dial setting. Place the compass on the map so that either side of the base plate intersects the symbol for the chosen site (a).
  • Page 16 Johnson Outdoors Inc. Canada Johnson Outdoors Gear LLC 4180 Harvester Road 625 Conklin Road Burlington, Ontario Canada L7L 6B6 Binghamton, NY 13903 1.905.634.0023 Fax 1.800.661.1170 www.silvausa.com Johnson Outdoors Gear LLC. © 2009 p/n 5793150C 2-09...

How to Set Declination on a Silva Compass

Source: https://www.manualslib.com/manual/755180/Silva-515.html