Editing SAR Fundamentals/Compass practical and pacing
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# identify cardinal directions | # identify cardinal directions | ||
# identify directions in degrees | # identify directions in degrees | ||
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See "[[SAR Fundamentals/Navigation/Map/Direction|Navigation - map - direction]]" | See "[[SAR Fundamentals/Navigation/Map/Direction|Navigation - map - direction]]" | ||
for the lesson plan that provides these prerequisites. | for the lesson plan that provides these prerequisites. | ||
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== Objectives == | == Objectives == | ||
- | At the conclusion of this lesson the participants will be able to | + | At the conclusion of this lesson the participants: |
- | + | # will be able to ... | |
- | + | ||
- | + | * shooting a bearing with a compass | |
- | + | * pacing | |
- | + | * exercises: | |
+ | ** bearings | ||
+ | ** pacing / bearing | ||
+ | * backbearing | ||
+ | * offsets | ||
== Time Plan == | == Time Plan == | ||
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Present Objectives | Present Objectives | ||
- | {{lesson slide|00:03| | + | {{lesson slide|00:03|}} |
'''Review - declination''' | '''Review - declination''' | ||
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* In our part of the world magnetic north is to the east of north, so we have EAST declination | * In our part of the world magnetic north is to the east of north, so we have EAST declination | ||
* Declination changes each year as the north magnetic pole moves | * Declination changes each year as the north magnetic pole moves | ||
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{{quote-page|Navigation/Declinations}} | {{quote-page|Navigation/Declinations}} | ||
+ | * ''Give declination for lesson location to the nearest degree (ignore seconds)'' | ||
* We should always ask what the declination is for our search area | * We should always ask what the declination is for our search area | ||
- | {{lesson slide| | + | {{lesson slide||}} |
'''Setting declination''' | '''Setting declination''' | ||
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* '' Check that each student has correctly set declination'' | * '' Check that each student has correctly set declination'' | ||
- | {{lesson slide| | + | {{lesson slide||}} |
'''Review - compass failures''' | '''Review - compass failures''' | ||
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** don't stand underneath high power lines | ** don't stand underneath high power lines | ||
- | {{lesson slide| | + | {{lesson slide||}} |
'''Holding compass''' | '''Holding compass''' | ||
- | * about | + | * about arm's length away from you |
** don't have lanyard around your neck | ** don't have lanyard around your neck | ||
- | * hold the compass about at | + | * hold the compass about at eye level |
* hold the compass level | * hold the compass level | ||
* ''demonstrate'' | * ''demonstrate'' | ||
- | {{lesson slide| | + | {{lesson slide||}} |
+ | '''Sighting''' | ||
+ | |||
+ | * sighting requires that you have several things working at once. | ||
+ | * close one eye | ||
+ | * fold the mirror so you can see all of the bezel in it | ||
+ | ** when you hold the mirror away from you, you're looking in the mirror; you're not looking down at the bezel directly | ||
+ | * make sure you're holding the compass level | ||
+ | * make sure you see the center line in the mirror slices through the middle of the needle | ||
+ | * use the sighting notch at the top of the mirror center line to spot your target | ||
+ | ** you may have to raise or lower the compass slightly to bring the target into view | ||
+ | ** some compasses also have a sighting notch at the bottom of the mirror center line | ||
+ | * RECHECK you have all things correct at the same time: | ||
+ | *# one eye closed | ||
+ | *# compass level | ||
+ | *# can see all of bezel in mirror | ||
+ | *# mirror center line through needle center | ||
+ | *# can see target in notch | ||
+ | * ''demonstrate'' | ||
+ | * ''have each student sight on an object on the far distance; have them verbally confirm each of the sighting requirements'' | ||
+ | ** ''Because you can't put your head where the student's head is, you won't be able to check all of their sighting requirements, but can check whether they are holding compass level, have one eye closed. You can approximate the others by looking over their shoulder.'' | ||
+ | |||
+ | {{lesson slide||}} | ||
'''Aligning needle''' | '''Aligning needle''' | ||
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* we want to put the "red to the bed" | * we want to put the "red to the bed" | ||
* two ways | * two ways | ||
- | ** rotate | + | ** rotate the compass until they line up |
** rotate the bezel until they line up | ** rotate the bezel until they line up | ||
* ''demonstrate both methods'' | * ''demonstrate both methods'' | ||
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- | {{lesson slide| | + | {{lesson slide||}} |
'''needle parallax''' | '''needle parallax''' | ||
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* direction near north and south are easy to align, near east or west are harder | * direction near north and south are easy to align, near east or west are harder | ||
- | {{lesson slide| | + | {{lesson slide||}} |
- | + | ||
- | + | ||
- | + | * when we're using bearings we need to use the mirror | |
- | + | * the mirror makes it more difficult to align the mirror | |
- | + | * because we're looking sideways at the needle, not straight down | |
- | * | + | |
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- | * | + | |
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- | {{lesson slide| | + | {{lesson slide||}} |
'''Reading a bearing''' | '''Reading a bearing''' | ||
- | * | + | * reading bearing |
+ | ** rotating barrel | ||
+ | ** "red to the bed" | ||
+ | ** parallax problem | ||
+ | *** parallel needle edge, not needle in the middle | ||
+ | ** practice reading bearings to several objects | ||
+ | ** vary distance and note differences in error | ||
- | * | + | * walking a bearing |
- | * | + | ** setting bearing |
- | * | + | ** how far to look |
+ | ** practice finding destinations at several bearings | ||
- | + | 3/ Pacing | |
- | + | ||
- | * | + | * Step is one foot to the opposite |
- | + | * Pace is one foot to the same foot (two steps) | |
- | + | ||
- | + | ||
- | * | + | |
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- | + | * counting your pace | |
- | + | ||
- | * | + | * measure your pace in 10m |
- | * | + | * calculating distance from paces |
- | + | ||
- | + | ||
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- | * | + | * calculating paces from distance |
- | + | ||
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- | + | 4/ Exercises: bearings | |
- | + | ||
- | + | ||
- | * | + | * hand-out: Pacing and Traverse |
- | + | 5/ Advance | |
- | + | ||
- | + | As they come up in discussion, describe: | |
- | + | ||
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- | * | + | * back bearings |
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- | * | + | * offsets |
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{{lesson slides end}} | {{lesson slides end}} | ||
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{{prompt|What materials are needed or useful in presenting this lesson.}} | {{prompt|What materials are needed or useful in presenting this lesson.}} | ||
* [[:Image:2010-03-18 22 25 36u-scan.pdf|Pacing and bearing exercise]] | * [[:Image:2010-03-18 22 25 36u-scan.pdf|Pacing and bearing exercise]] | ||
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* Tape measure | * Tape measure | ||
* Compasses | * Compasses | ||
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** http://forum.oldweather.org/index.php?topic=1056.0 | ** http://forum.oldweather.org/index.php?topic=1056.0 | ||
* SAR Fundamentals - Chapter 13 - Navigation | * SAR Fundamentals - Chapter 13 - Navigation | ||
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== Question bank == | == Question bank == | ||
{{prompt|List of questions suitable for an review/exam of this section.}} | {{prompt|List of questions suitable for an review/exam of this section.}} | ||
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== Frequently Asked Questions == | == Frequently Asked Questions == | ||
{{prompt|What are some of the questions that students typically ask. Include the answers.}} | {{prompt|What are some of the questions that students typically ask. Include the answers.}} | ||
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{{prompt|What can others do with this lesson?}} | {{prompt|What can others do with this lesson?}} | ||
+ | Copyright © 2010, Chris Jorgensen. | ||
Copyright © 2010-2013, Brett Wuth. | Copyright © 2010-2013, Brett Wuth. | ||
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This work is licensed under a | This work is licensed under a | ||
Creative Commons Attribution-NonCommercial 2.5 Canada License. | Creative Commons Attribution-NonCommercial 2.5 Canada License. |