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. 2014 Dec 10;9(12):e114557. doi: 10.1371/journal.pone.0114557

Figure 7. Vertical plane bicoordinate geomagnetic space in the Western Atlantic Ocean region.

Figure 7

Polar (A, C) and Cartesian (B, D) plots of geomagnetic field coordinates for a 0.5° latitude-longitude grid between 20° and 42° north latitude and −67° and −78° west longitude (A, B; n = 1035) and all of the one-hourly juvenile osprey GPS-enabled PTT tag locations we report (C, D; n = 244 locations from ten birds). The {0;0} coordinate space origin in all panels corresponds with the subcrustal origin of Earth's main magnetic field.