<para>
This option specifies the maximum allowable distance between adjacent points in the
track.  If two points in the track are further apart than this value, new
points will be inserted between them.
</para>
<para>
The units may be specified by appending a suffix to the supplied number:
</para>
<simplelist type="vert">
<member>'m' for meters, e.g. 3500.0m</member>
<member>'ft' or 'feet' for feet, e.g. 11483ft</member>
<member>'k' or 'km' for kilometers, e.g 3.5000km</member>
<member>'nm' for nautical miles, e.g. 1.8898nm</member>
<member>'mi' for miles, e.g. 2.1748mi</member>
<member>'fa' for fathoms, e.g. 1913.82fa</member>
</simplelist>
<para>
If no units are specified, the units are assumed to be miles.
</para>
<para>
Either this option or the <option>time</option> must be specified.
</para>
