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Chapter 8: Installation 8-23
SeaTalk® and NMEA
In
SeaTalk
®
and NMEA In
The display can receive a comprehensive range of data. The primary data is
described below:
*Accurate heading data is required for MARPA, and it must be provided on
NMEA. We recommend the Pathfinder Smart Heading System (which
includes the Gyro Plus 2 unit) or a Raymarine autopilot system incorporating
a 150G or 400G Course Computer with internal rate gyro.
Heading data should ideally contain both magnetic and true heading. If only
one is available then variation needs to be provided either manually or
automatically - see Variation Sourceon page 7-8.
Some other radars and chartplotters can exchange their cursors via SeaTalk.
Locked heading should be used for Course Up if available via SeaTalk.
Otherdataconnectedvia aSeaTalkbus orvia NMEAisgenerallydisplayedin
data boxes, e.g. depth, apparent wind angle and speed, time.
Note: The Raymarine Fishfinder usesits own depth data, rather than anyoth-
er depth data on SeaTalk. If there is noother depth data on SeaTalk, Fishfind-
er depth is transmitted. If speed and temperature data are available on
SeaTalk the Fishfinder uses this data; if this data isnot on SeaTalk from other
instruments, it is transmitted by the Fishfinder.
For details of received data refer to the table in Appendix D:SeaTalk and
NMEA Data Received and Transmitted. Examples of SeaTalk and NMEA
systems are shown in Figure 8-13 and Figure 8-14.
Table 8-4: Function of SeaTalk and NMEA Data
Data Primary Uses Suggested Source
Heading Heading Modes
MOB (if Speed data also available)
MARPA (radar)
Autopilot,
Compass connected to SeaTalk bus
NMEA Compass*
Position MOB (also requires speed and HDG
data)
Position data in data box and Nav
Window
Waypoints & Marks
Own vessel position (chart)
Data Log (chart)
SeaTalk GPS connected via Auxiliary JB
Existing GPS Navigator via SeaTalk bus
Existing GPS (or Loran-C) navigator with
NMEA output
Waypoint Chart: Waypoint and route transfer Existing GPS Navigator via SeaTalk bus
Existing GPS (or Loran-C) navigator with
NMEA output
81186_3.book Page 23 Thursday, August 22, 2002 8:23 AM