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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Radio Navigation > Why can a narrow pencil beam be preferable to a broad fan-shaped mapping beam for distant ground features?

186 - ATPL Question Bank in English - Why can a narrow pencil beam be preferable to a broad fan-shaped mapping beam for distant ground features?

Question 186 - Radio Navigation - ATPL - Airline Transport Pilot Licence

It concentrates more antenna gain in a smaller angular region, helping obtain usable returns beyond the useful range of the broad mapping beam.

A narrow beam is required only when approaching coastlines in polar regions.

A wider vertical beam always gives stronger returns from distant targets.

A pencil beam removes all ground-clutter and atmospheric-attenuation effects.

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