What is the significance of flying at odd thousands of feet for aircraft tracking at what heading?

Flying at odd thousands of feet is significant for aircraft tracking as it provides a standardized altitude assignment for aircraft operating on headings that fall within the range of 000-179 degrees. This practice helps in maintaining vertical separation between aircraft traveling in opposite directions, which is essential for safety and efficiency in controlled airspace.

When aircraft are flying towards each other (one on a heading of 180 degrees and the other on 000 degrees), the odd altitude assignment allows air traffic control to more effectively manage and separate these flights. This organization reduces the risk of mid-air collisions and ensures that all aircraft can navigate safely and efficiently in shared airspace.

The other ranges mentioned do not apply to the same standard. For headings of 180-359 degrees, the assignment would typically be even altitudes; for 90-179 degrees, the same principles of altitude assignment apply; and 360 degrees is a redundant term as it is essentially equivalent to 0 degrees. Therefore, odd thousands of feet serve a critical function for aircraft on the appropriate headings.