--- /dev/null
+<para>
+ This option specifies the datum to be used on output. Valid values for this
+ option are listed in <xref linkend="Datums" />.
+</para>
--- /dev/null
+<para>
+ This value specifies the grid to be used on write. It is similar to
+ the grid option of garmin_txt (see <xref linkend="garmin_grid" />). The only difference is that unicsv does not
+ write a degree sign (°) into the output file.
+</para>
+<para>
+ Without this option unicsv writes the coordinates as simple numbers like in the samples above.
+</para>