Garmin Personal Navigator GPS 48 Owner's Manual & Reference

Also see for Personal Navigator GPS 48: Declaration of conformity Supplementary guide Specifications

Garmin Personal Navigator GPS 48 Owner's Manual & Reference Manual pdf 56 page image

Interface SetupThe GPS 48’s interface page lets you specify the for-mats for connecting external devices. There are sixoptions: GRMN/GRMN, None/None, RTCM/None,RTCM/NMEA, NMEA/NMEA, and None/NMEA. Eachoption lists the input format first, followed by the outputformat.To select I/O format:1. Highlight the I/O field, and press E.2. Select the desired setting, and press E.The GRMN/GRMN setting is a proprietary formatthat lets you exchange information such as waypoints,routes, and track logs between two GARMIN GPS unitsor a GARMIN GPS and a PC. There are eight data trans-fer options: send alm, send wpt, send trk, send rte,request alm, request wpt, request trk, request rte.To select a transfer option:1. Highlight ‘HOST’, and press E.2. Select a desired setting, and press E.To disable all interfacing capabilities, select theNone/None setting. If you want to output NMEA datawithout any differential input capability, select‘None/NMEA. Once a NMEA output setting has beenselected, the NMEA field will become highlighted. NMEAformats 0180, 0183 or 0183 (1.5 or 2.0) are available.The data transfer rate can be set to 130, 300, 600, 1200,2400, 4800 or 9600 baud.DGPS InterfaceThe last two format settings allow the differential-ready GPS 48 to accept RTCM DGPS corrections inRTCM 104 version 2.0 format. Using DGPS correctionswill improve receiver accuracy to 1-5 meters, regardlessof errors induced by the government’s SelectiveAvailability (SA) program. Two RTCM options are avail-able: RTCM/NONE, which allows connection to a beaconreceiver with no output capability; and RTCM/NMEA,which allows DGPS input and NMEA output.Once a RTCM setting has been selected, the GPS 48will either automatically try to tune the last frequencyand bit rate you selected or will switch to the default fre-quency of 304.0 kHz with a bit rate of 100 bps if no pre-vious beacon has been tuned. You may also enter yourown frequency and bit rate if desired.Interface SetupREFERENCE52Choose an interfaceoption based upon whatequipment you are usingto transfer information.Once the RTCM option isselected the GPS 48 willautomatically tune itselfor display a default fre-quency.