PNI Legacy Comm Board User Manual
Page 25
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dampsize (Digital Damping Sample Size)
Sets the value for the digital damping of the compass heading output. Refer to specific module
data sheet for more information.
Note: For modules that do not have an onboard processor (for example, the MicroMag), the
CommBoard will calculate and output this data
Syntax:
dampsize
Response Format:
$dampsize=nn*
Valid Values:
nn
1 – 8 for the MicorMag (1 is the default)
1 – 8 for the V2Xe (1 is the default)
Query Syntax:
dampsize?
mag_dec (Declination Value)
Sets the declination offset for a reading of True North. Based on the setting of the Compass Units
(uc) command. Positive declination is easterly declination and negative is westerly declination.
This is not applied until True North is set to true.
Declination, also called magnetic variation, is the difference between true and magnetic north,
relative to a point on the earth. 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 head-
ing 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 Geo-
physical Data Center web page below to get the declination angle based on your latitude and lon-
gitude: http://www.ngdc.noaa.gov/cgi-bin/seg/gmag/fldsnth1.pl
Note: For modules that do not have an onboard processor (for example, the MicroMag), the
CommBoard will calculate and output this data
Syntax:
mag_dec
Response Format:
$mag_dec=nnn*
Valid Values:
nnn = ±180
If
uc = d
, then mag_dec is in degrees (default is 0)
nnn = ±3200
If
uc = m
, then mag_dec is in mils (default is 0)
Query Syntax:
mag_dec?
CommBoard
Module Commands