Start: Click this button to split the selected occupation into two distinct
occupations of the same nature. The resulting first occupation
represents about 10% of the initial occupation and the second one,
about 90%. On splitting the occupation, GNSS Solutions automatically
selects the first (shorter) occupation (shown in dark blue on the
time chart below). The exact duration of the selected occupation (and
hence of the second) can be set by editing the Time Span field.