Here's another technique called "right angle navigation." 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. 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. 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. ... Techniques for extending the bearing … 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. A 70 degree compass bearing is a 60 degree bearing on the map. 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 … 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. Coronavirus (COVID-19) Update ... Back Bearings. In this case, you decide to turn left, (due south). A back bearing (AKA a reciprocal bearing) is the opposite direction of your original bearing. A 280 degree magnetic bearing will be 270 degrees (due west) on a map oriented to true north with a 10 degree west declination. You need to deduct magnetic variation from the compass reading to convert it. An erasable pencil: A pencil is needed for navigation via chart so you can mark down important items like speed, location, and bearings. This bearing is a magnetic bearing rather than a grid bearing, which your map uses. First, it makes getting back to your starting point easy — just follow the back bearing of your original bearing. 3. 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. Turn the dial so the direction of travel arrow and the marking line point to 180 degrees. You will subtract a westerly declination. There is universal recognition of these nautical navigation terms, which helps in eliminating the risk of misunderstanding. This trigonometry video tutorial provides a basic introduction into bearings. Plotting tools can slip and slide, so take a few moments to double check the bearing. Measure the danger bearing. Basic land navigation only requires three (3) "tools". Turn 90 degrees from your bearing. Draw a line from the charted object back out onto the water. Use a protractor or plotter to find the bearing to the object. We're back at the downed tree again and want to navigate around it on a bearing of 270 degrees (due west). 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. The magnetic variation is currently 0º to 5º throughout Great Britain (this amount changes annually, so check your OS … 0° (and 360°) are aligned with our north reference, 90° is to the East, 180° to the South, and 270° to the West. Back bearings are also useful for verifying that you’re still on your original bearing line. Extend it far enough so that you can start taking bearings one to two miles before you pass the danger. A wristwatch or stopwatch: In order to perform one of the most basic forms of navigation—ded reckoning (or "deduced reckoning"), which we’ll talk more about in a moment—you need to keep track of time. 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