How to use a small boat magnetic compass
The direction on the small boat magnetic compass is indicated in degrees ranging from 0 degrees for north to 180 degrees for south. The marine compass has a lubber line on its glass surface, aiding in determining the direction of the boat. When selecting the direction of a planned route on a nautical chart in degrees, ensure that the ship's lubber line aligns with the planned direction in degrees. The boat will then navigate along the chosen route.
Overview
The structure of a small boat magnetic compass
Specific steps of operating a small boat compass
Ensure the compass is accurately aligned. Compass dials can experience deviation due to various factors, so it's essential to check for accuracy before departure. Pay attention to the compass direction when entering or leaving ports; most nautical charts mark the specific direction of harbor buoys. Confirm that the compass direction matches the charted direction when entering or leaving ports. If there are problems with the compass, calibrate it first.
Use the nautical chart to select a route. Determine the starting and ending points and draw a line between them to establish the route. Some ships require specific angles for navigation, so consider the angle along with wind direction and strength's impact on speed.
Once the route is established, ensure that the ship's lubber line remains at the planned angle throughout the navigation process.
Water flow change can cause deviations in course. When setting sail, remember the opposite angle corresponding to the departure angle. This angle can be used to return regardless of the ship's location. Some compasses have an opposite lubber line. If there are no two lubber lines, add 180 degrees to the degree reading of the ship's lubber line.
