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`Units <#toc9>`_
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For map distance unit, append *unit* **d** for arc degree, **m** for arc
minute, and **s** for arc second, or **e** for meter [Default], **f**
for foot, **k** for km, **M** for statute mile, **n** for nautical mile,
and **u** for US survey foot. By default we compute such distances using
a spherical approximation with great circles. Prepend **-** to a
distance (or the unit is no distance is given) to perform "Flat Earth"
calculations (quicker but less accurate) or prepend **+** to perform
exact geodesic calculations (slower but more accurate).
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