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GPS 18
User Manual
Garmin GPS 18 010-00321-56 User Manual
Product codes
010-00321-56
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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
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