The magnetic variation is currently 0º to 5º throughout Great Britain (this amount changes annually, so check your OS … Measure the danger bearing. A back bearing (AKA a reciprocal bearing) is the opposite direction of your original bearing. With our simplified navigation system, all you really need is a compass body with a clear lubber line on it, a floating card with N, S, E and W plus tick marks between--and nothing else. You need to deduct magnetic variation from the compass reading to convert it. In this case, you decide to turn left, (due south). Extend it far enough so that you can start taking bearings one to two miles before you pass the danger. 3. Along with a good quality topographical map of the area you're navigating, knowing how to use a compass will ensure that you're never lost. Basic land navigation only requires three (3) "tools". For more information on forward and back bearings, ... For navigation purposes, we use an angular measurement system where a circle is divided into 360 degrees. A variety of nautical navigation terms are used in recording information on a nautical map such as bearings, headings, and other important map navigation data. 0° (and 360°) are aligned with our north reference, 90° is to the East, 180° to the South, and 270° to the West. Draw a line from the charted object back out onto the water. Turn the dial so the direction of travel arrow and the marking line point to 180 degrees. A 280 degree magnetic bearing will be 270 degrees (due west) on a map oriented to true north with a 10 degree west declination. Here's another technique called "right angle navigation." A 70 degree compass bearing is a 60 degree bearing on the map. You can use these to check back to your starting point – perhaps you set off from a rock that’s still visible, or a fence post. Knowing your back bearing has a few uses. ... Techniques for extending the bearing … Most scuba compasses, unfortunately, are loaded down with features designed for use with the number system, and retain only vestiges of the cardinal points system. An erasable pencil: A pencil is needed for navigation via chart so you can mark down important items like speed, location, and bearings. A topographic map, a compass (for this Instructable I will be using a basic orienteering compass), and a dry erase marker (if your map is … Back bearings are also useful for verifying that you’re still on your original bearing line. First, it makes getting back to your starting point easy — just follow the back bearing of your original bearing. Navigation Skills for Walking and Hiking Good navigation skills, whether you are using map and compass with or without a GPS device, can reveal whole new areas of the countryside allowing the average hiker to leave the relative safety of the tourist paths and explore. It is the opposite of converting a map bearing to a compass bearing. There is universal recognition of these nautical navigation terms, which helps in eliminating the risk of misunderstanding. We're back at the downed tree again and want to navigate around it on a bearing of 270 degrees (due west). This trigonometry video tutorial provides a basic introduction into bearings. You will subtract a westerly declination. You can learn to identify the basic components of the compass, take an accurate reading of your bearings, and start developing the necessary skills of navigation with a few simple steps. Plotting tools can slip and slide, so take a few moments to double check the bearing. Home » Outdoor Skills and Tips » Map Reading and Navigation » Navigation Skills 10 – Better Bearings . Turn 90 degrees from your bearing. 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