The compass rose on charts helps determine which navigational variable for a region?

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Multiple Choice

The compass rose on charts helps determine which navigational variable for a region?

Explanation:
Magnetic variation is what the compass rose communicates. It shows the difference between true north and magnetic north for that area, so mariners can convert between true bearings (used in navigation planning) and magnetic bearings (what the ship’s compass actually shows). The compass rose usually marks the angle between those two norths, often with an East or West sign, and this variation can change by location and over time, so the chart’s value must be used for each voyage. Speed, depth, and tide are separate navigational concerns and aren’t indicated by the compass rose.

Magnetic variation is what the compass rose communicates. It shows the difference between true north and magnetic north for that area, so mariners can convert between true bearings (used in navigation planning) and magnetic bearings (what the ship’s compass actually shows). The compass rose usually marks the angle between those two norths, often with an East or West sign, and this variation can change by location and over time, so the chart’s value must be used for each voyage. Speed, depth, and tide are separate navigational concerns and aren’t indicated by the compass rose.

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