Radar Observer · Display — Orientation
A north-up radar presentation differs from head-up in that:
- AIt removes the need for a compass
- BThe top of the screen is always the ship's head
- CIt cannot show other vessels
- DThe top of the screen is true (or magnetic) north and the picture is compass-stabilized, so it does not swing when the ship yaws✓ Correct
Explanation
North-up requires a compass input and fixes north at the top, giving a steady picture that matches the chart and does not smear when the ship yaws — good for navigation and plotting. Head-up puts the ship's heading at the top (no compass needed) but the whole picture rotates with every yaw. Course-up steadies the picture on the intended course.
Authority: Bowditch (Pub. No. 9), Radar Display
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