North reference, Endianess, Table 6-1: mounting orientations – PNI SeaTRAX User Manual
Page 28: 2 north reference, 3 endianess
PNI Sensor Corporation
DOC#1018154 r02
SeaTRAX User Manual
Page 23
Table 6-1: Mounting Orientations
SeaTRAX
Studio
Description
Figure 4-2
Description
SeaTRAX
Studio
Description
Figure 4-2
Description
Standard
STD 0°
Y Sensor Up
“Y” Up 0°
Standard 90
Degrees
STD 90°
Y Sensor Up Plus
90 Degrees
“Y” Up 90°
Standard 180
Degrees
STD 180°
Y Sensor Up Plus
180 Degrees
“Y” Up 180°
Standard 270
Degrees
STD 270°
Y Sensor Up Plus
270 Degrees
“Y” Up 270°
X Sensor Up
“X” Up 0°
Z Sensor Down
“Z” Down 0°
X Sensor Up Plus
90 Degrees
“X” Up 90°
Z Sensor Down
Plus 90 Degrees
“Z” Down 90°
X Sensor Up Plus
180 Degrees
“X” Up 180°
Z Sensor Down
Plus 180 Degrees
“Z” Down 180°
X Sensor Up Plus
270 Degrees
“X” Up 270°
Z Sensor Up Plus
270 Degrees
“Z” Down 270°
6.3.2
North Reference
Declination, also called magnetic variation, is the difference between true and magnetic
north. It is measured in degrees east or west of true north. Correcting for declination is
accomplished by storing the correct declination angle, and then changing the heading
reference from magnetic north to true north. Declination angles vary throughout the
world, and change very slowly over time. For the greatest possible accuracy, go to the
National Geophysical Data Center web page below to get the declination angle based on
your latitude and longitude:
Magnetic
When the <Magnetic> button is selected, heading will be relative to magnetic north.
True
When the <True> button is selected, heading will be relative to true north. In this
case, the declination needs to be set in the “Declination” window.
6.3.3
Endianess
Select either the <Big> or <Little> Endian button. The default setting is <Big>. See
Sections 7.2 for additional information.