Garmin TracPak GPS 30/30 SL Manual page 27

baud rate. At 9600 and 4800 baud, sentences are transmitted
every second. At 2400 baud, sentences are transmitted
every two seconds and at 1200 baud, every four seconds.
GPALM and PGRMT transmission rates are defined in
Sections 4.2.3 and 4.2.10, respectively.
4.2.1.2 GPS 30 SL
Sentences are transmitted with respect to the user selected
baud rate.
Regardless of the selected baud rate, the information
transmitted by the GPS 30 SL is referenced to the one-pulse-
per-second output pulse immediately preceeding the GPRMC
sentence.
The GPS 30 SL will transmit each sentence (except where
noted in particular transmitted sentence descriptions) at a
periodic rate based on the user selected baud rate and user
selected output sentences. The sensor board will transmit
the selected sentences contiguously.
transmission starts at a GPS second boundary. The length
of the transmission can be determined by the following
equation and tables:
Length of transmission =
Baud characters_transmitted_per_sec
1200 120
2400 240
4800 480
9600 960
Sentence max_characters
GPGGA 72
GPGSA 65
GPGSV 140
GPRMC 70
GPVTG 34
The contiguous
total characters to be transmitted
characters transmitted per sec
22