Commercial Pilot License (CPL) Practice Exam 2025 - Free Commercial Pilot License Practice Questions and Study Guide

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What is the formula to find ADF magnetic bearing?

MH + VOR = MB

RB - MH = MB

MH + RB = MB

To determine the ADF (Automatic Direction Finder) magnetic bearing, the relationship involves adding the magnetic heading (MH) to the relative bearing (RB) from the ADF indicator. This is because the relative bearing is measured from the aircraft's current heading towards the station, and to find the magnetic bearing to the station, you add this relative bearing to the current magnetic heading of the aircraft.

Specifically, when you add the relative bearing to the magnetic heading, you are essentially transforming the relative position of the station into a magnetic direction relative to your aircraft's current course. Therefore, accurately calculating the magnetic bearing requires this addition.

The other options do not correctly define the relationship necessary for calculating the ADF magnetic bearing. For instance, subtracting relative bearing from magnetic heading is not applicable in this context, as it would give a direction that doesn’t align with the method of navigation intended when using ADF.

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MB = MH - RB

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