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GSM19 Series Magnetometers - Version 7
GEM Systems, Inc. Advanced Magnetometers
For more technical information, visit www.gemsys.ca
NOTES:
For a standard survey do not use LINE INCREMENT (set it to 0). You can use
LINE INCREMENT if you are surveying a base line or tie-line. Otherwise you
would be walking diagonally on your grid.
If you are planning to use station interpolation for walk files (see section 6.2.3),
keep in mind the number of readings and the distance between pickets by
managing the cycling time and the station increment. If you have too many
readings and small station increments, some interpolated stations have repeated
values.
5.3.3 Understanding the Line / Station Positioning System
N
station
station
station
station
600.00W
587.50W
587.50E
600.00E
W
E
If you walk East from station 600.00W
If you walk West from station 600.00E
you must use -12.50 station
you must use -12.50 station
increment.
increment.
S
In both cases, when you pass through station 0.00, the GSM-19 automatically changes E to W or W
to E and the sign of the station increment.
The station increment is used in a mathematically correct way and is related to the direction in
which you are walking. As per the above diagram the same applies to N or S stations.