What is the minimum altitude for VFR cruising, and on what basis is it determined?

The minimum altitude for VFR (Visual Flight Rules) cruising is determined based on the magnetic course of the aircraft. Specifically, for aircraft operating under VFR in uncontrolled airspace, the altitude requirements state that if flying at or above 3,000 feet AGL (Above Ground Level) but below 18,000 feet MSL (Mean Sea Level), pilots are required to maintain a cruising altitude that is appropriate for their magnetic course.

If the magnetic course is between 0° and 179°, the pilot should fly at an odd thousand-foot altitude, plus 500 feet (for instance, 3,500 ft, 5,500 ft, etc.). Conversely, if the magnetic course is between 180° and 359°, the pilot should select an even thousand-foot altitude, plus 500 feet (like 4,500 ft, 6,500 ft, etc.). This ensures that aircraft flying in opposite directions are separated vertically, contributing to flight safety in shared airspace.

The other options refer to altitudes that don't align with established VFR regulations or do not use the correct basis (magnetic course) for determining cruising altitudes, which is crucial in ensuring proper altitude assignment relative to the course of flight.