Maretron SSC200 User Manual download pdf (Page 19)

Revision 1.8 Page 15

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4.4 Variation Source Selection

As shipped from the factory, the SSC200 automatically looks for variation from both the NMEA

0183 and NMEA 2000

interfaces. If there is only a single source of variation available (either

from the NMEA 0183 or the NMEA 2000

interface), then there is no need to manually select a

variation source. However, if there are multiple variation sources (i.e., variation available from

both the NMEA 0183 and NMEA 2000

interfaces) or there is no source for variation (i.e.,

variation is not available from either the NMEA 0183 or the NMEA 2000

interfaces), then it is

necessary to select a particular variation source. The SSC200 can be programmed to

specifically use one of three possible variation sources:

1. Variation from Only NMEA 0183 Interface

2. Variation from Only NMEA 2000

Interface

3. Variation from Only Manual Entry

The SSC200 can be programmed to accept a specific source for the variation data using one

of two possible procedures.

1. Using a Maretron Display (Section 4.4.1)

2. Through the NMEA 0183 Interface (Section 4.4.2)

4.4.1 Variation Source Selection via Maretron Display

You can program the SSC200 to use a particular variation source using a Maretron display

product (e.g., DSM200). Refer to the display product user’s manual for details on programming

the SSC200 to use a specific variation source.

4.4.2 Variation Source Selection via NMEA 0183 Interface

You can program the SSC200 to use a particular variation source through the NMEA 0183

interface. Refer to Appendix A for details on programming the SSC200 to use a specific

variation source.

5 Rate of Turn

The SSC200 is capable of measuring a vessel’s rate of turn and outputting the information

over both the NMEA 0183 and NMEA 2000

interfaces. Furthermore, the SSC200 has a

programmable damping period where the filter time can be increased for very slow turning

vessels such as tugs pushing barges. Also, the SSC200 rate of turn indication may be zeroed

to correct for any temperature-induced offset.

The SSC200 can be programmed with different damping periods and have the rate of turn

indication zeroed using one of two possible procedures.

1. Using a Maretron Display (Section 5.1)

2. Through the NMEA 0183 Interface (Section 5.2)

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Maretron SSC200 User Manual Page 19