Garmin 16" x 4.2 TRANSMITTED NMEA 0183 SENTENCES, 4.2.1Sentence Transmission Rate, Baud, Table, Sentence, Output by Default, Maximum Characters, Characters per Second

4.2 TRANSMITTED NMEA 0183 SENTENCES

The subsequent paragraphs define the sentences that can be transmitted on COM 1 by the GPS sensor.

4.2.1Sentence Transmission Rate

Sentences are transmitted with respect to the user selected baud rate.

The GPS sensor 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 GPS sensor will transmit the selected sentences contiguously. The length of the transmission can be determined by the following equation and Tables 2 and 3:

			total characters to be transmitted
length of transmission =		---------------------------------------------
			characters transmitted per second
	Sentence		Output by Default?			Maximum Characters
	GPRMC					74
	GPGGA					82
	GPGSA					66
	GPGSV					70
	PGRME					35
	GPGLL					44
	GPVTG					42
	PGRMV					32
	PGRMF					82
	PGRMB					40
	PGRMM					32
	PGRMT					50
	Table		2: NMEA 0183 Output Sentence Order and Size
			Baud	Characters per Second
		4800			480
		9600			960
		19200			1920
		38400			3840

Table 3: Characters per Second for Available Baud Rates

The maximum number of fields allowed in a single sentence is 82 characters including delimiters. Values in the table include the sentence start delimiter character “$” and the termination delimiter <CR><LF>. The factory set defaults will result in a once-per-second transmission at the NMEA 0183 specification transmission rate of 4800 baud.

Regardless of the selected baud rate, the information transmitted by the GPS sensor is referenced to the one-pulse- per-second output pulse immediately preceding the GPRMC sentence, or whichever sentence is output first in the burst (see Table 2 above).

190-00228-08	GPS 16x Technical Specifications	Rev. A
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