Raymarine C120, Installation Manual

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12 C-Series Displays Installation Manual
What is NMEA?
NMEA 0183
The NMEA 0183 Data Interface Standard was developed by the National Marine
Electronics Association of America. It is an international standard to enable equipment
from many different manufacturers to be connected together and share information.
The NMEA 0183 standard carries similar information to SeaTalk. However it has the
important difference in that one cable will only carry information in one direction. For
this reason NMEA 0183 is generally used to connect a data receiver and a transmitter
together, e.g. a compass sensor transmitting heading to a radar display.
This information is passed in ‘sentences’, each of which has a three-letter sentence
identifier. It is therefore important when checking compatibility between items that
the same sentence identifiers are used:
• VTG - carries Course and Speed Over Ground data.
• GLL - carries latitude and longitude.
• DBT - carries water depth.
• MWV - carries relative wind angle and wind speed data.
NMEA 2000
NMEA 2000 offers significant improvements over NMEA 0183, most notably in speed
and connectivity. Up to 50 units can simultaneously transmit and receive on a single
physical bus at any one time, with each node being physically addressable.
The standard was specifically intended to allow for a whole network of marine
electronics from any manufacturer to communicate on a common bus via
standardized message types and formats.
2.3 Compatibility
Radar Scanners
CAUTION: Radar Scanners, Cables & Installation
Information on radar scanners, cables and their installation contained in
this handbook supersedes that contained in the Pathfinder Radar
Scanner Handbook, Document No. 81154_8, dated 12th January 2005.
To achieve full radar compatibility with your C-Series Display, your Raymarine radar
scanner may require upgrading. Please check the list below to see if this upgrade is
required.
The scanner serial number can be found on a label attached to the scanner casing:
87020-3.book Page 12 Tuesday, March 7, 2006 11:02 AM