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GPS 18 Technical Specifications (190-00307-00) Rev. D
Page ii
TABLE OF CONTENTS
1 Introduction..................................................................................................................1
1.1 Cautions ............................................................................................................................................1
1.2 Limited Warranty..............................................................................................................................2
1.3 Features.............................................................................................................................................3
1.4 GPS 18 Series....................................................................................................................................4
1.4.1 GPS 18 USB...................................................................................................................................... 4
1.4.2 GPS 18 PC ........................................................................................................................................ 4
1.4.3 GPS 18 LVC, GPS 18 LVC-5m, and GPS 18-5Hz ........................................................................... 4
1.5 Technical Specifications ...................................................................................................................5
1.5.1 Physical Characteristics..................................................................................................................... 5
1.5.1.1 Size.................................................................................................................................... 5
1.5.1.2 Weight............................................................................................................................... 5
1.5.1.3 Color.................................................................................................................................. 5
1.5.1.4 Case Material..................................................................................................................... 5
1.5.1.5 Cable Length ..................................................................................................................... 5
1.5.2 Electrical Characteristics................................................................................................................... 5
1.5.2.1 Input Voltage..................................................................................................................... 5
1.5.2.2 Input Current ..................................................................................................................... 5
1.5.2.3 CMOS Serial Output Levels.............................................................................................. 5
1.5.2.4 GPS Receiver Sensitivity .................................................................................................. 6
1.5.3 Environmental Characteristics........................................................................................................... 6
1.5.4 GPS Performance.............................................................................................................................. 6
1.5.4.1 Receiver............................................................................................................................. 6
1.5.4.2 Acquisition Times ............................................................................................................. 6
1.5.4.3 Update Rate....................................................................................................................... 6
1.5.4.4 Accuracy ........................................................................................................................... 6
1.5.5 Interfaces........................................................................................................................................... 7
1.5.5.1 GPS 18 Electrical Characteristics...................................................................................... 7
1.5.5.2 Garmin Interface and Garmin USB Protocol..................................................................... 7
1.5.5.3 GPS 18 PC, GPS 18 LVC, & GPS 18-5Hz Protocols........................................................ 7
1.5.5.4 Measurement Pulse Output (GPS 18 LVC & GPS 18-5Hz only)...................................... 7
2 GPS 18 LVC & GPS 18-5Hz Wiring and Pinouts ....................................................8
2.1 GPS 18 LVC & GPS 18-5Hz Pinout.................................................................................................8
2.2 GPS 18 LVC & GPS 18-5Hz Wiring Diagrams ...............................................................................8
3 Mechanical Characteristics & Mounting.................................................................10
4 GPS 18 PC, GPS 18 LVC, & GPS 18-5Hz Software Interface..............................12
4.1 Received NMEA 0183 Sentences ...................................................................................................12
4.1.1 Almanac Information (ALM)...........................................................................................................12
4.1.2 Sensor Initialization Information (PGRMI)......................................................................................13
4.1.3 Sensor Configuration Information (PGRMC) ..................................................................................13
4.1.4 Additional Sensor Configuration Information (PGRMC1) ..............................................................14
4.1.5 Output Sentence Enable/Disable (PGRMO).....................................................................................14
4.2 Transmitted NMEA 0183 Sentences...............................................................................................15
4.2.1 Sentence Transmission Rate.............................................................................................................15
4.2.2 Transmitted Time.............................................................................................................................16
4.2.3 Global Positioning System Almanac Data (ALM)...........................................................................16
4.2.4 Global Positioning System Fix Data (GGA) ....................................................................................17
4.2.5 GPS DOP and Active Satellites (GSA)............................................................................................17
4.2.6 GPS Satellites in View (GSV)..........................................................................................................17
4.2.7 Recommended Minimum Specific GPS/TRANSIT Data (RMC) ....................................................18
4.2.8 Track Made Good and Ground Speed (VTG) ..................................................................................18