Table of Contents
A-iv ENVI-MAG Manual
Operating the ENVI-MAG............................................... A5-1
Accurate and meaningful measurements ..................... A5-1
Orientation ..................................................................... A5-2
Effects of gradient .......................................................... A5-2
Other sources of noise .................................................... A5-3
On the staff.................................................................... A5-3
On the back plate ............................................................ A5-3
Base-station................................................................... A5-3
Repeated surveys lines ................................................... A5-4
WALKMAG—
Total-field/Gradiometer
(Automatic mode)............................................................. A5-5
Check your setup ............................................................ A5-6
Start survey ................................................................... A5-6
WALKGRAD gradiometer survey ....................................... A5-7
Manual mode—
Total-field/Gradiometer
(Semi-automatic) ............................................................. A5-8
Check your setup ............................................................ A5-9
Start survey ................................................................... A5-9
Automating your measurements..................................... A5-10
Base-station operation ................................................. A5-11
Check your setup .......................................................... A5-11
Start operation............................................................. A5-12
Search mode................................................................... A5-13
Basic ........................................................................... A5-13
Advanced...................................................................... A5-13
Survey data correction procedures............................. A5-15
Using base-station data ................................................ A5-15
Tie-point (TIE-PT) mode .................................................. A5-16
Loop type—collecting data....................................... A5-16
Line type—collecting data........................................ A5-17
Tie-point correction procedure ....................................... A5-19
Basic modes (Loop only) ........................................... A5-19
Advanced modes ..................................................... A5-19
Remote operation .......................................................... A5-20
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