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Magnetic declination is the direction and amount of variation between the Magnetic Pole and True North. The amount and direction of declination depends upon how those two poles align relative to a given point on Earth. When the two poles align, declination is zero, and the line of zero declination is termed the agonic line. At points west of the agonic line, a magnetic needle will point east of true north (positive declination). At points east of the agonic line, a magnetic needle will point west of true north (negative declination). There is a pattern, but it does not follow meridians or parallels. Isogonic lines are like magnetic contour lines -they trace a path of constant magnetic declination. | Magnetic declination is the direction and amount of variation between the Magnetic Pole and True North. The amount and direction of declination depends upon how those two poles align relative to a given point on Earth. When the two poles align, declination is zero, and the line of zero declination is termed the agonic line. At points west of the agonic line, a magnetic needle will point east of true north (positive declination). At points east of the agonic line, a magnetic needle will point west of true north (negative declination). There is a pattern, but it does not follow meridians or parallels. Isogonic lines are like magnetic contour lines -they trace a path of constant magnetic declination. |
Revision as of 02:39, 31 January 2021
Orientación | ||
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Asociación General
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Destreza: 2 Año de introducción: 1956 |
Requisitos
Template:Division variant (GC)/es
La especialidad de Orientación es un componente de la Maestría Vida Primitiva. |
La especialidad de Orientación es un componente de la Maestría Recreación. |
Conexión Logros para la Investidura: Esta especialidad está relacionada con los requisitos de Logros para la Investidura para VIAJERO AL AIRE LIBRE Vida al Aire Libre que requiere completar esta especialidad o una de 4 otras, no obtenida previamente. |
Para esta especialidad, necesitará una brújula militar como la del enlace hacia Amazon. También necesitará mapas topográficas que se pueden descargar gratuitamente o se pueden comprar.
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These symbols are used by the U.S. National Park Service:
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4
4a
4b
4c
4d
4e
4f
4g
4h
4i
4j
4k
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6
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Method #1
(These directions assume your orienting arrow lines up with the North indicator on your compass dial, meaning the compass has not been adjusted for declination).
Magnetic declination is the direction and amount of variation between the Magnetic Pole and True North. The amount and direction of declination depends upon how those two poles align relative to a given point on Earth. When the two poles align, declination is zero, and the line of zero declination is termed the agonic line. At points west of the agonic line, a magnetic needle will point east of true north (positive declination). At points east of the agonic line, a magnetic needle will point west of true north (negative declination). There is a pattern, but it does not follow meridians or parallels. Isogonic lines are like magnetic contour lines -they trace a path of constant magnetic declination.
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Place the compass on the map so the baseplate parallels the north-to-south map neat line. Rotate the dial until compass ring North agrees with map North. Add or subtract the amount needed to adjust for local magnetic declination (subtract if local declination is positive, add if local declination is negative); if your adjustable declination compass is already calibrated for local declination, you don’t need to add or subtract, just make sure compass ring North (not the orienting arrow) agrees with map North. Holding the map and compass steadily (the baseplate should still be on the north-to-south map neat line), rotate the map and compass all in one motion until the red magnetic needle overlays the orienting arrow. Again, make sure there is no interference from metal when you perform this (ex: rebar in concrete). Your map and your compass are now oriented to true north. Compare the physical features around you with your map to help derive your location on the map..
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Resection is a method of using a compass and a map to determine your current position. The first step is to find a feature of the landscape that you can also identify on the map. This could be a mountain peak, an intersection, a bridge, or even a utility pole (some topographic maps mark where high-voltage lines are, as well as the position of the poles that hold them up). The closer these two landmarks are to 90° offset from one another, the more accurate the resection will be. For instance, if the first landmark is at 115°, choose the second one as close to either 205° (115°+90°) or 25° (115°-90°) as you can. This is not a hard and fast rule, and the prominence of the landmark may well be more important than the 90° offset. Once you have shot an azimuth to the first landmark, calculate the back azimuth, and plot a line on your map from the landmark towards (and past) your current position (which should be somewhere on that line). Be sure to correct for declination when plotting this line. Then shoot the azimuth of the second landmark, and plot it's back azimuth on the map as well, again correcting for declination. If your readings are accurate and your plotting was done carefully, your current position should be very close to where these two lines intersect.
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References
- Answer to requirements 5 and 6 were adapted from the U.S. Army Field Manual FM 3-25.26
- Answers to requirement 7 and 8 were taken verbatim from http://education.usgs.gov/common/lessons/how_to_use_a_compass_with_a_usgs_topographic_map.html
- Categoría: Tiene imagen de insignia
- Adventist Youth Honors Answer Book/Honors/es
- Adventist Youth Honors Answer Book/es
- Adventist Youth Honors Answer Book/Skill Level 2/es
- Categoría: Libro de respuestas de especialidades JA/Especialidades introducidas en 1956
- Adventist Youth Honors Answer Book/General Conference/es
- Adventist Youth Honors Answer Book/Unknown/es
- Adventist Youth Honors Answer Book/Unknown/Primary/es
- Adventist Youth Honors Answer Book/Stage 0/es
- Adventist Youth Honors Answer Book/Wilderness Master Award/es
- Adventist Youth Honors Answer Book/Recreation Master Award/es
- Adventist Youth Honors Answer Book/IAConnection/es