Abstract
A careful historical analysis of geomagnetic charts shows that their uses have changed between the fifteenth century and the present time. Their exclusive use for navigation has been expanded to a broad application spectrum that includes all orientation purposes and, more recently, prospecting activities and basic geomagnetic research. Such changes have necessitated considerable modifications in chart production, including more accurate data acquisition and analysis, besides the introduction of different methods of graphical representation, in order to express the geomagnetic main field or a local field including anomalies. An adequate choice of scales is essential to discriminate different kinds of field representation. As a consequence of a lack of coordinated work and the stage of scientific development, geomagnetic charts for Latin America do not present a desirable uniformity. For this season, the Pan-American Institute of Geography and History Working Group on Geophysical Maps is attempting to improve geomagnetic charts, through coordinated work on all parts of the subject.
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