Definition

Noun: A mariner's compass is a navigational instrument in the form of a circular card, marked with directional points, that rotates freely. Its 0-degree mark (North) aligns itself to point toward the Earth's magnetic north pole, allowing sailors to determine their heading.

Usage

The term mariner's compass specifically refers to the classic, card-style magnetic compass used for sea navigation. It distinguishes this instrument from other types of compasses (like a prismatic compass or a digital GPS compass).

Examples

• The captain fixed his course by checking the mariner's compass mounted near the ship's wheel.
• Before modern electronics, the mariner's compass was the most critical tool for ocean navigation.
• The mariner's compass card swung wildly as the storm affected the local magnetic field.

Advanced Usage

• Historical Context: The development of the mariner's compass was a pivotal advancement in the Age of Exploration, enabling longer and safer sea voyages.
• Technical Operation: A mariner's compass works because its magnetized needle (attached to the bottom of the card) is influenced by the Earth's magnetic field.

Variants and Related Words

• Compass (n): The general term for any direction-finding instrument. A mariner's compass is a specific type of compass.
• Magnetic compass (n): A broader term that includes the mariner's compass and other compasses operating on the same magnetic principle.
• Binnacle (n): The protective stand or case that houses a mariner's compass on a ship.

Synonyms

• Navigational compass
• Ship's compass
• Magnetic compass (in the context of nautical use)

Related Idioms/Phrases

• To box the compass: This nautical phrase means to recite all 32 principal points of the mariner's compass in correct order. It is used to describe a thorough or complete turn or reversal.
  • Example: The debate boxed the compass, covering every possible argument on the topic.

Noun

1. compass in the form of a card that rotates so that 0 degrees or North points to magnetic north