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12.7.3 Receive NMEA sentences IN to Server
There are 5 different main types of NMEA sentences:
1) Position related data: Position, SOG/COG, time, and a limited
amount of satellite status if a GPS is connected. The information
is read if no other Nexus GPS is connected. If a Nexus GPS is
connected, it will take over the navigation.
2) Navigation data: (BTW), (DTW), (BOD), (XTE), (SET) and
(DRIFT). This information is read only if C75 NAV is set to (ON).
The Server will automatically send data to the Nexus Network.
E.g.: (DRIFT), (WCV), (TTG) and (CTS).
3) Waypoint data: Is received from (WPL) data if (C73 WPR) is
set to on (ON). Nexus Server version 1.7 and higher can receive
(NMEA WP) and re-transmit to an active Nexus navigator through
the Nexus Network.
4) Compass heading is read only if (C76 CMP) is set to (ON).
Heading is either (HDT) (priority) or (HDM). Magnetic variation
(from Nexus Network) is added to (HDM) but not to (HDT).
5) Relative wind angle and wind speed is read from (VWR) data,
only if (C77 WND) is set to (ON). True wind angle and wind speed
is calculated by Nexus, when the boat speed (the speed of the
water) is known.
The following NMEA sentences can be received IN to Server:
AAM Waypoint arrival alarm
APA Autopilot sentence ”A” (old)
APB Autopilot sentence ”B”
BOD Bearing original destination
BWC Bearing and distance to waypoint
BWR Bearing and distance to waypoint (old)
GGA Global position fix data (GPS)
GLL Geographic position, Latitude/Longitude
HDM Heading, magnetic
HDT Heading, true
RMA Minimum specific Loran data
RMB Minimum navigation information
RMC Minimum specific GPS/transit data
SNA Navigation status
VDR Set & drift
VTG Track made good and ground speed
VWR Relative wind speed and direction
WPL Waypoint location
XTE Cross-track-error, measured
ZDA Time & date
For connection of NMEA instrument IN to Server, (see 2.6).
All data (POSITION, BTW, SOG/COG, etc.) is received from one
type of NMEA sentence. If data is placed in different locations, the
data will be selected from the sentence with the highest priority.
CALIBRATION
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