Garmin GPS 18x Series Technical Specifications

Also see for GPS 18x LVC: Declaration of conformity

Contents

Garmin GPS 18x Series Technical Specifications Manual pdf 19 page image

190-00879-08 GPS 18x Technical Specifications Rev. BPage 154.2 TRANSMITTED NMEA 0183 SENTENCESThe subsequent paragraphs define the sentences that can be transmitted by the GPS 18x 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 sentence descriptions) at aperiodic rate based on the user selected baud rate and user selected output sentences. The GPS sensor will transmitthe selected sentences contiguously. The length of the transmission can be determined by the following equation andTables 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 35GPGLL 44GPVTG (18x-5Hz) 42PGRMV 32PGRMF 82PGRMB 40PGRMMPGRMT Once per minute 50Table 2: NMEA 0183 Output Sentence Order and SizeBaud Characters per Second4800 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. Values in thetable include the sentence start delimiter character “$” and the termination delimiter . For the GPS 18xPC and LVC, the factory set defaults result in a once per second transmission at the NMEA 0183 specificationtransmission rate of 4800 baud. For the GPS 18x-5Hz, the factory set defaults will result in a five times per secondtransmission at 19200 baud.For the GPS 18x LVC: Regardless of the selected baud rate, the information transmitted by the GPS sensor isreferenced to the one-pulse-per-second output pulse immediately preceding the GPRMC sentence, or whicheversentence is output first in the burst (see Table 2 above).For the GPS 18x-5Hz: Regardless of the selected baud rate, the information transmitted by the GPS sensor isreferenced to the preceding five-times-per-second output pulse.The GPS 18x USB can use Spanner (an application that can provide NMEA output via a virtual COM port) toreceive the same default NMEA sentences as the GPS 18x PC and LVC at a rate of once per second. Spanner isavailable for free on the Garmin web site. To download the software, start at www.garmin.com/oem, select the GPS18x USB, and then select Updates & Downloads.