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guides:land_nav [2017/04/21 14:40] thendash |
guides:land_nav [2017/04/21 16:25] thendash added bearing and intersection sections |
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~~Title: Land Navigation~~ | ~~Title: Land Navigation~~ | ||
- | ===== LAND NAVIGATION ===== | + | ===== LAND NAVIGATION(WIP) ===== |
By: Thendash | By: Thendash | ||
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**Symbols** | **Symbols** | ||
- | {{ :guides:legend-for-arma-3-map.gif?direct&300|}} | + | {{ :guides:legend-for-arma-3-map.gif?direct&300|Click to view full size}} |
Because it is often not practical to show certain objects at scale on a map, or because more information than just the shape and size of | Because it is often not practical to show certain objects at scale on a map, or because more information than just the shape and size of | ||
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**Reading a grid** | **Reading a grid** | ||
+ | {{ :guides:gridref.png?direct&300|Click to view full size}} | ||
It is easy to read 2, 4, and 6 digit grid references from the ARMA map because the map scales as you zoom in and out, but you can read a | It is easy to read 2, 4, and 6 digit grid references from the ARMA map because the map scales as you zoom in and out, but you can read a | ||
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Contour lines never intersect because any point on a contour line is at the same elevation above or below sea level. | Contour lines never intersect because any point on a contour line is at the same elevation above or below sea level. | ||
+ | |||
+ | ===== EQUIPMENT ===== | ||
+ | ==== COMPASS ==== | ||
+ | {{ :guides:compass.png?direct&300|Click to view full size}} | ||
+ | |||
+ | The compass is a tool used to measure direction. The version modeled in ARMA is a lensatic compass with both degree and milliradian | ||
+ | markings. | ||
+ | |||
+ | **Measuring Direction** | ||
+ | |||
+ | Typically we measure direction either generally using the cardinal directions, or more precise using degrees. Mils are not often used in | ||
+ | ARMA. | ||
+ | - **Cardinal Direction:** The four cardinal directions are displayed on the center of the compass ring and allow for quick reference of general direction. | ||
+ | - **Bearing Degrees:** The inner ring of the compass shows degrees printed every ten degrees and a hash mark every five degrees. There are 360 degrees. | ||
+ | - **Bearing Mils:** The outer ring of the compass shows mils printed every 200 mils, large hash mark every 100 mils, and a small hash mark every 20 mils. There are 6400 mils. | ||
+ | |||
+ | ==== MAP TOOLS ==== | ||
+ | The ACE3 MapTool is currently broken. | ||
+ | |||
+ | ==== DAGR ==== | ||
===== NAVIGATION TECHNIQUES ===== | ===== NAVIGATION TECHNIQUES ===== | ||
- | ==== EQUIPMENT ==== | + | ==== BEARING ==== |
+ | Technically //azimuth// is the proper term, but the term //bearing// is commonly used to refer to the direction to an object or location | ||
+ | in relation to magnetic North. | ||
+ | |||
+ | In ARMA we do not need to worry about the difference between magnetic bearings measured with a compass, and grid bearings measured on the | ||
+ | map. | ||
+ | |||
+ | **Taking a Bearing** | ||
+ | |||
+ | To measure a bearing from your current location to a visible object: | ||
+ | - Line up the //sighting wire// on your compass with the object | ||
+ | - Read the bearing in degrees where the //index line// intersects with the //inner ring.// | ||
+ | |||
+ | **Back Bearing** | ||
+ | |||
+ | A back bearing is the opposite direction of a bearing. It is commonly required for use during land navigation. | ||
+ | |||
+ | To convert a bearing into a back bearing: | ||
+ | * **Add 180 degrees** if the bearing is **180 degrees or less** | ||
+ | * **Subtract 180 degrees** if the bearing is **180 degrees or greater** | ||
+ | |||
+ | ==== LOCATION ==== | ||
+ | **INTERSECTION** | ||
+ | {{ :guides:intersection.png?direct&300|Click to view full size}} | ||
+ | |||
+ | Intersection is the location of an unknown point by successively occupying at least two known positions on the ground and then map | ||
+ | sighting on the unknown location. It is not often used in ARMA, but can be used to locate the position of an otherwise inaccessible location. | ||
+ | **Steps:** | ||
+ | - Measure the direction to the target from known location 1. | ||
+ | - Draw the bearing from known location 1. | ||
+ | - Move, or communicate with someone at a different known location. | ||
+ | - Measure the direction to the target from known location 2. | ||
+ | - Draw the bearing from the known location 2. | ||
+ | - (Optional)Repeat from subsequent known locations as desired. | ||
+ | - The **intersection** of the drawn bearings is the location of the target. |