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2.13 THE NAVIGATION MENU
The decoding of navigation input telegrams is based on the recognition of a start
sequence, a field separation character and a stop character. The "useful"
substring within the total telegram is identified by specifying the position of the
first field and the number of fields to be included in the navigation data
substring.
In the start sequence up to 6 start characters may be defined. However, if there
is no trouble with ambiguity, some of the characters may be set to ? which
indicates "don't care" to test against equality.
NMEA 0183 navigation telegrams are properly interpreted using the default
settings shown above. Assuming the NMEA 0183 telegram
$GPGLL,4728.31,N,12254.25,W<CR><LF>
the "useful" navigation data substring becomes
Note that <CR> denotes carriage return and <LF> denotes linefeed.
The useful part of the incoming navigation telegrams is continuously displayed
when the Navigation Menu is selected.
P3402/C
Navigation Menu
Navig. Input
Start Sequence
Separation Char.
Stop Character
First Field No.
No. of Fields
Speed Input
Manual Speed
Baudrate
Bits Per Char.
Stop Bits
Parity
4728.31,N,12254.25,W
SERIAL
$GPGLL
002C
000D
2
4
Manual
10.0 knt
4800
8
1
None
Simrad EY 500
77
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