... mode 1.1
  For historical reasons, the GMT Default is Landscape, see gmtdefaults to change this.

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... plots 1.2
  ensures that boundary annotations do not fall off the page

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... database 1.3
  Wessel and Smith [1996]

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... inch)2.1
  PostScript definition. In the typesetting industry a slighly different definition of point (1/72.27 inch) is used.

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...3.1
  The -A option is necessary for geographic grids since x_inc shrinks with latitude. Rule of thumb: set aspect = cosine of the average latitude.

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