GSSI SIR 30, Manual

Page: 57 / 150

Geophysical Survey Systems, Inc. SIR® 30
Manual
MN 93-101 Rev E 51
The User should be aware that the number and location of Ticks (Major ticks) and Ticks per Major tick
(Minor Ticks) are scaled relative to the Units per Mark parameter of the Distance Control in the Systems
Settings menu (Figure 75 below).
Ticks Using Metric Units
Figure 75: Systems Settings Menu – Distance Control.
In Figure 75 above the Systems Settings menu is configured for 100 scans per meter, 5 units per mark. In
the Output Options > Display the Ticks per Unit are five (5), the Ticks per Major Tick are five (5).
Figure 76: Distance Scale – Ticks per Unit = five, Ticks per Major ticks = five.
Therefore, five ‘minor’ ticks equal one major tick i.e. a minor tick is placed every 20 cm and major tick is
placed every meter. The fifth major tick lines up with the distance mark placed in the data at 5 meters as
per the parameters set the Distance Control System Settings menu (Figure 75 above). GSSI recommends
that when collecting data using metric units to set the scan parameters such that the Scans per Unit divided
by the Ticks per Unit is a whole number and to set the Ticks parameters such that the Ticks per Major Tick
divided by the ticks per unit is a whole number. This will result in a consistent, evenly spaced scale