Spectra Precision FAST Survey Reference Manual - Manual (Page 59)

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CLO
: Use this code to close a figure. This tells the software to close from the last point coded as CLO back to
the first point of the figure. Note that after using a special code such as "CLO", appended with a space to the
description code "BLD", that the program automatically removes the special code as it defaults the next
description to "BLD". The "CLO" code also has the effect of ending the line and starting a new line. It only
works with codes defined as 2D or 3D polylines.
SMO
: Use this code to smooth the line through all of the points. This code must occur on the first point of the
line.