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RaceBox
26
5.5
Other Configuration Options
This section reviews miscellaneous configuration options and features which were not
addressed elsewhere in this manual.
5.5.1
Bow Location and Boat Length
To get the most accurate location data possible, the Race Box must be told how far aft
the GPS antenna is mounted on your boat. This number is in feet, may have a decimal
portion and is put in the configuration file like this:
; Specify boat length overall in feet. You may specify a
; decimal of a foot, such as 28.5.
;
BOATLENGTH=30
To tell the Race Box where the GPS antenna is mounted, enter it into the configuration
file like this:
; The number of feet aft from the bow where the GPS antenna is
; mounted. On a 30 foot boat, if the GPS antenna is on the
; very back of the stern, then this should be 30. You may
; specify a decimal of a foot, such as 22.7.
;
GPS_ANTENNA_LOCATION = 30
5.5.2
Position Data Source
The Race Box can take its position either from the Nexus Server or directly from a GPS
receiver (see “Connecting a GPS Receiver” earlier in this manual). In order to get
position data from the Nexus server, you need either a NMEA GPS receiver connected
to the Nexus servers NMEA in port or a Nexus nGPS receiver connected directly on the
Nexus network.
If the position data comes from the server, enter this line into the configuration file:
POSITION_DATA_SOURCE = F
The ‘F’ is for FDX.
You can also connect a NMEA GPS receiver directly to the Race Box on one of its
NMEA input ports. Currently, only NMEA port RX1 is supported. Data from a NMEA
GPS must be NMEA 0183 sentence RMC and the Race Box can accept up to 5 RMC
sentences per second. You can also set the baud rate. All standard baud rates up to
57,600 baud are supported. If your NMEA 0183 GPS can update at a rate of 5 updates
per second, you should set the baud rate to 57,600 baud.
To receive NMEA 0183 position data directly into the Race Box, at a baud rate of
38,400 baud, set the configuration file like this: