Quick Answer
Re-calculating bearings is critical on a trip because it helps to prevent navigation errors and maintain a safe course, especially in remote or unfamiliar areas. It ensures that the traveler remains on track and avoids getting lost.
Importance of Re-calculating Bearings
Re-calculating bearings is a crucial aspect of dead reckoning navigation. Dead reckoning involves tracking a route by calculating a location’s position based on the previous position, speed, and direction of travel. However, due to wind, currents, or other external factors, the actual course may deviate from the intended one. To account for this, a navigator must regularly re-calculate bearings to update their position and course.
Techniques for Re-calculating Bearings
To re-calculate bearings, a navigator can use various techniques. One common method is to use a compass to determine the current direction of travel, then compare it to the intended course. If the two directions differ, the navigator must adjust their course to stay on track. Another method is to use a map and protractor to measure the angle between two known landmarks, then apply trigonometry to calculate the new bearing.
Example of Re-calculating Bearings
For example, let’s say a hiker is traveling north along a river and intends to reach a destination 5 miles upstream. However, the wind is blowing at 10 mph, which is affecting their course. To re-calculate bearings, the hiker uses a compass to determine their current direction of travel, which is 10 degrees east of north. They then apply trigonometry to calculate the new bearing, taking into account the wind’s effect on their course. After re-calculating, the hiker adjusts their course to stay on track and reaches their destination safely.
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