The heading indicated by the gyro-compass was 3° higher than the true heading.

True Heading - 0 to 359 degrees derived from gyro input

Beyond that, add the Variation to get the True heading.

True Heading – 0 to 359 degrees derived from gyro input

However, due to the compass error, the aircraft’s true heading was 346°.

It helps to stabilize the shell in holding a true course when rowing.

We were at 10,000 feet altitude cruising on a true course of about 230 degrees at the time of the incident.

We were at 10,000 feet altitude cruising on a true course of about 230 degrees at time of incident.

We were at 10,000 feet altitude cruising on a true course of about 230 degrees at the time of the incident.

We were at 10,000 feet altitude cruising on a true course of about 230 degrees at time of incident.

The direction display deviates from the true direction determined by the earth’s magnetic field.

The flight path, or track, is the actual direction the plane must go to get to the intended destination.

Once the vessel was steadied on the pillar, Pilot No. 1 found the heading to be 349.5°G and ordered the helmsman to steer 349°G to make 346° true (T).