Tactics and Vectors 98/99
                           

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Great Circle Hypotheis  

Magnetoclinic Hypothesis

Magnetic-Latitude Hypothesis

Compass Bearings Hypothesis

Suns' Azimuth Hypothesis

Expansion-Contraction Hypothesis

Always Advance Hypothesis

Never Go Back Hypothesis

Compass divided into acceptable sectors and forbidden sectors

Labels

• GCR TB = 232° Theoretical Bearing of Great Circle route to overwintering sites
• AS = acceptable sector

• FS = Forbidden Sector

Notes

1. All bearings within Acceptable Sector are suitable because followed then will reduce the Great Circle distance to the overwintering sites.
2. All bearings into the forbidden sector must be avoided because following then increases the Great Circle distance to the overwintering sites.