Garmin GPS 18 Technical Specifications

Also see for GPS 18 5Hz: Reference guide Features Setup guide

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Garmin GPS 18 Technical Specifications Manual pdf 21 page image

GPS 18 Technical Specifications (190-00307-00) Rev. DPage 154.2 TRANSMITTED NMEA 0183 SENTENCESThe subsequent paragraphs define the sentences that can be transmitted by the GPS 18 PC and LVC.4.2.1 Sentence Transmission RateSentences are transmitted with respect to the user selected baud rate.The GPS sensor will transmit each sentence (except where noted in particular transmitted sentencedescriptions) at a periodic rate based on the user selected baud rate and user selected output sentences. TheGPS sensor will transmit the selected sentences contiguously. The length of the transmission can bedetermined by the following equation and Tables 2 and 3:total characters to be transmittedlength of transmission = ---------------------------------------------characters transmitted per secondSentence Output by Default? Maximum CharactersGPRMC 74GPGGA 82GPGSA 66GPGSV (PC and LVC only) 70PGRME (PC and LVC only) 35GPGLL 44GPVTG (18-5Hz only) 42PGRMV 32PGRMF 82PGRMB (PC and LVC only) 40PGRMT Once per minute 50Table 2: NMEA 0183 Output Sentence Order and SizeBaud Characters per Second300 30600 601200 1202400 2404800 4809600 96019200 192038400 3840Table 3: Characters per Second for Available Baud RatesThe maximum number of fields allowed in a single sentence is 82 characters including delimiters. Valuesin the table include the sentence start delimiter character “$” and the termination delimiter . Forthe GPS 18 PC and LVC, the factory set defaults result in a once per second transmission at the NMEA0183 specification transmission rate of 4800 baud. For the GPS 18-5Hz, the factory set defaults will resultin a five times per second transmission at 19200 baud.For the GPS 18 LVC: Regardless of the selected baud rate, the information transmitted by the GPS sensoris referenced to the one-pulse-per-second output pulse immediately preceding the GPRMC sentence, orwhichever sentence is output first in the burst (see Table 2 above).For the GPS 18-5Hz: Regardless of the selected baud rate, the information transmitted by the GPS sensor isreferenced to the preceding five times per second output pulse.