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Fig. 6. Isoclinics (lines of equal magnetic inclination) and isodynamics (lines of
equal magnetic field intensity) in the Indian Ocean, along the east coast of
Africa. Isoclinics run approximately east–west in this region and are
shown in 1° contours. Isodynamics run approximately north–south and
are represented in 1000 nT increments. Thus, in this geographic area, the two
sets of isolines form a nonorthogonal grid that birds, sea turtles, fish or
other animals might, in principle, exploit as a kind of bicoordinate magnetic
map. Whether any animal does this is not known. (Modified from
Lohmann et al., 1999.)
Isolines were derived for the year 1995 from the International Geomagnetic
Reference Field (IGRF) 1995 model.
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