Fig. 3From: The global geomagnetic field over the historical era: what can we learn from ship-log declinations?Geomagnetic field intensity (top) and standard deviation (bottom) for the epoch 1700 CE. Depicted are the three models ArchKalmag14k, HistKalmag.no_D and HistKalmag. The maps are centered at the Pacific, as this region is covered densely only by the ship-log declination dataBack to article page