Table of Contents
Great Circle Hypotheis
Compass Bearings Hypothesis
Suns' Azimuth Hypothesis
Always Advance Hypothesis
Never Go Back Hypothesis
Compass divided into acceptable
sectors and forbidden sectors
- GCR TB = 232° Theoretical Bearing of Great Circle route to overwintering sites
- AS = acceptable sector
- All bearings within Acceptable Sector are suitable because followed then will reduce
the Great Circle distance to the overwintering sites.
- All bearings into the forbidden sector must be avoided because following then
increases the Great Circle distance to the overwintering sites.