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Extreme Endurance Migration: What Is the Limit to Non-Stop Flight?

Figure 5

Illustration of how the great circle (orthodrome) and rhumb line (loxodrome) differ between two locations on the spherical globe.

The rhumb line is a constant compass course from the point of departure to the destination, while the great circle involves a continuous shift of the compass direction. On the global view shown here, great circles appear as straight lines if passing through the centre.

Figure 5