Final answer:
The magnetic compass will read most accurately on the heading of 180 degrees and 0 degrees during a level 360-degree turn with a bank of approximately 15 degrees.
Step-by-step explanation:
The magnetic compass will read most accurately on the heading of 180 degrees and 0 degrees during a level 360 degree turn with a bank of approximately 15 degrees. This is because the magnetic compass is affected by the Earth's magnetic field, and at these headings, the compass needle aligns with the magnetic field lines and provides a more accurate reading.