What is the fixed line mark attached to the compass book of the magnetic compass called

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Multiple Choice

What is the fixed line mark attached to the compass book of the magnetic compass called

Explanation:
The fixed line is the lubber line. It stays stationary on the compass housing and serves as the forward reference of the vessel. As the compass card rotates to indicate a bearing, you align that bearing against the lubber line to read the ship’s heading relative to forward. Other lines on the dial either move with the card or denote different directional references, but they are not the fixed forward reference provided by the lubber line.

The fixed line is the lubber line. It stays stationary on the compass housing and serves as the forward reference of the vessel. As the compass card rotates to indicate a bearing, you align that bearing against the lubber line to read the ship’s heading relative to forward. Other lines on the dial either move with the card or denote different directional references, but they are not the fixed forward reference provided by the lubber line.

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