GSSI SIR 4000, Manual

Page: 93 / 163

Geophysical Survey Systems, Inc. SIR® 4000
Manual
MN72-433 Rev F 87
Recollecting or Skipping Lines
If you need to skip or redo a line, use Next Line or Previous Line in the Grid Display to move around the
grid. You will see the yellow line move to indicate your current position. Once the yellow line matches
your current location press the green Start button to collect or recollect the line. The new data file will be
stored with the proper positioning info and any old data will be overwritten.
Adding a Line Segment
You can collect portions of a line or stop and
start collection along a line by using the Add
Segment button. There are two ways to use
this button.
Offset the Starting Position:
You can
choose to start away from the baseline if
needed.
1
Position the antenna along the line where
you’d like to start.
2
Press Add Segment and then the green
Start button.
3
Move antenna to the end of the line and
position the center of the antenna over the
opposite baseline from where you started.
4
Press the red Stop button. This will end the line and shift it so that it lines up with the opposite
baseline.
Skipping a Section of the Line:
You can skip a section in the middle of a line to avoid an obstacle.
You can avoid one obstacle per line.
1
Begin data collection from the baseline as
normal.
2
When you reach the section you want to
skip press the red Stop button briefly.
3
Move the antenna to the opposite side of
the area being skipped and line it up on
the same path.
4
Press Add Segment to begin data
collection again.
5
Move antenna to the end of the line and
position the center of the antenna over the
opposite baseline from where you started.
6
Press the red Stop button. This will end the line and shift it so that it lines up with the opposite
baseline.