In the mnemonic, what term corresponds to Compass?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

In the mnemonic, what term corresponds to Compass?

The idea being tested is how headings are broken into parts that affect what you read on a compass and how you move from true north to the instrument reading. In this mnemonic, the four terms represent the sources of heading error or reference headings you work with: deviation (error caused by the ship’s own magnetism), variation (difference between true north and magnetic north), gyro (the gyro compass heading), and compass (the actual reading you get from the ship’s compass). The term that corresponds to the Compass is the compass itself—the instrument reading you rely on for steering. In practice, you start from a true heading, adjust for variation to get magnetic heading, then apply deviation to arrive at the compass heading you read on the instrument. The gyro heading is a separate reference you compare against to check for gyro error and drift, but the compass term in the mnemonic specifically denotes the instrument’s reading. So, the compass term is the instrument reading you obtain from the compass, the final heading you use at the helm. The other terms describe the errors and references used to relate true, magnetic, and gyro headings to that compass reading.

The idea being tested is how headings are broken into parts that affect what you read on a compass and how you move from true north to the instrument reading. In this mnemonic, the four terms represent the sources of heading error or reference headings you work with: deviation (error caused by the ship’s own magnetism), variation (difference between true north and magnetic north), gyro (the gyro compass heading), and compass (the actual reading you get from the ship’s compass).

The term that corresponds to the Compass is the compass itself—the instrument reading you rely on for steering. In practice, you start from a true heading, adjust for variation to get magnetic heading, then apply deviation to arrive at the compass heading you read on the instrument. The gyro heading is a separate reference you compare against to check for gyro error and drift, but the compass term in the mnemonic specifically denotes the instrument’s reading.

So, the compass term is the instrument reading you obtain from the compass, the final heading you use at the helm. The other terms describe the errors and references used to relate true, magnetic, and gyro headings to that compass reading.

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