SSC300 User’s Manual
Page 10
Revision 1.0
At this point, you must change the baud rate of your connection to 38400 baud to continue, as
the SSC300 has now been set to the higher baud rate.
tm storebaud
This causes the new baud rate to be stored to non-volatile memory, so the compass will retain
this baud rate when it is powered down.
2.4.3 Connecting Both NMEA 2000
®
and NMEA 0183 Interfaces
The SSC300 can be simultaneously connected to both an NMEA 2000
®
network and an NMEA
0183 network.
2.4.4 Checking Connections
Once the NMEA 2000
®
/Power and/or NMEA 0183 connections to the Maretron SSC300 have
been completed, check to see that heading information is being properly transmitted by
observing an appropriate display. Refer to Section 7
, “Troubleshooting”, if no heading
information appears, otherwise proceed to Section 3
entitled “Calibration”.
3 Calibration
In order to provide accurate heading indication, the SSC300 must be calibrated in the vessel
after installation. The three calibration procedures that must be carried out are rate of turn zero
offset calibration (Section 3.1), magnetic deviation calibration (Section 3.2) and installation-offset
correction
(Section 3.4).
These procedures should be carried out after the initial compass installation and again at any
time that the magnetic environment of the vessel has changed significantly (for example, new
cables have been routed near the compass or new equipment made of ferrous metal has been
installed near the compass).
WARNING: It is imperative that calibration procedures be carried out upon installation of
the SSC300 to ensure accurate readings.
3.1 Rate of Turn Zero Offset Calibration
Since the SSC300 uses the internal rate of turn gyros during the magnetic deviation calibration
process, the rate of turn gyros need to zeroed first
. It is possible to do “Rate of Turn Zeroing”
using a Maretron display product, such as the DSM150, DSM250, or N2KAnalyzer software
(please refer to the display product user’s manual for details).
3.2 Installation-Offset Correction (First Time)
After installation and prior to magnetic deviation calibration, it is important to perform installation-
offset correction so that the compass is aware of its exact orientation in the installation. The
heading is also set during this process, but will be set once more after magnetic deviation
calibration. Installation-offset correction is done using one of four possible procedures.
1. Maretron Display Product Initiated (Section 3.2.1)
