Compass Error Calculation is an important step in Coastal Navigation, as it helps mariners determine the accuracy of their ship's compass readings. By understanding and compensating for any errors in the compass, navigators can ensure precise and reliable navigation along the coast.
Compass errors can arise due to various factors such as magnetic influences, local deviations, and even the ship's own magnetic fields. To calculate these errors, mariners typically perform a procedure known as "Swinging the Compass." During this process, the ship is steered on a series of known headings while comparing the ship's compass readings with the true or magnetic headings.
The first step in Compass Error Calculation is to obtain the deviation table. This table records the differences between the compass readings and the true or magnetic headings for a range of steering positions. By swinging the compass on different headings, mariners can gather accurate data to create this table.
Once the deviation table is created, it is used to correct the ship's compass readings during navigation. When the compass reads, for example, 270 degrees, the navigator can refer to the deviation table to determine the accurate heading based on the ship's magnetic compass error at that particular steering position.
It's important to note that Compass Error Calculation is a dynamic process, as the ship's magnetic fields and influences may change over time. Therefore, it is recommended to regularly update the deviation table to ensure accurate readings.
By diligently calculating and compensating for compass errors, mariners can navigate confidently along the coast, accurately determining their ship's heading and position. This enables them to avoid navigational hazards and safely reach their destination.
