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Cruising VFR more than 3,000 feet AGL on a magnetic course of 090, which altitude follows the rule?

Q: Cruising VFR more than 3,000 feet AGL on a magnetic course of 090, which altitude follows the rule?

Odd thousands plus 500, like 5,500 feet MSL. The rule applies only above 3,000 feet AGL and below 18,000 feet MSL, and it uses magnetic course, not heading.

Odd thousands plus 500, like 5,500 feet MSL.

5,500 feet MSL ✔
6,500 feet MSL
6,000 feet MSL

Why: Rule 91.159 assigns VFR flights on magnetic courses 0 to 179 degrees to odd thousands plus 500 feet. Courses 180 to 359 use even thousands plus 500 feet.

Huh, didn't know that: The rule applies only above 3,000 feet AGL and below 18,000 feet MSL, and it uses magnetic course, not heading.

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Sources

14 CFR 91.159 VFR cruising altitude or flight level (eCFR) https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-91/subpart-B/subject-group-ECFR4d7cd0e3cc4be86/section-91.159

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Cruising VFR more than 3,000 feet AGL on a magnetic course of 090, which altitude follows the rule?

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