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GPS 18 Technical Specif ications (190-00307- 00) Rev. D Garmin International, Inc. 1200 E. 151 st Street Olathe, KS 66062 USA 190-00307-00 , Revision D June 2005 GPS 18 TECHNICAL SPECIFICATIONS.
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GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page i © Copyright 2004–2005 Garmin Ltd. or its subsidiaries All Rights Reserved Except as expressly provided below, no part of th is manual .
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page ii TABLE OF CONTENTS 1 Introduction ..................................................................................................................1 1.1 Cautions .........................
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page iii 4.2.9 Geographic Position (GLL) ..............................................................................................................18 4.2.10 Estimated Error Information (PGRM E) .
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GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 1 1 INTRODUCTION 1.1 CAUTIONS CAUTION The GPS system is operated by the government of the United States, which is solely responsible for its accuracy and maintenance.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 2 1.2 LIMITED WARRANTY This Garmi n product is warranted to be free from defects in m aterials or workmans hip for one y ear from the date of purchase. Within this period, Garmin w ill at its sole option, repa ir or replace any components that fail in normal use.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 3 Overview The GPS 18 series products incl ude an embedde d recei ver and an ante nna. Based on the proven technology found in other Garmin.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 4 1.4 GPS 18 SERIES There are several differe nt versions of GPS 18 available. Refer bel ow for a list of the three m ajor di visions of the GPS 18 Series. 1.4.1 GPS 18 USB The GPS 18 USB interfaces t o a co mputer with a n available USB port.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 5 1.5 TECHNICAL SPECIFICATIONS Specifications are subject to change without notice. 1.5.1 Physical Characteristics 1.5.1.1 Size 61 mm in di ameter and 1 9.5 mm in height 1.5.1.2 Weight • GPS 18 unit only (no cab le): 1.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 6 1.5.2.4 GPS Receiver Sensitivity -165 dBW m i nim um 1.5.3 Environmental Characteristics • Operating Temperature: -30°C to +80°C • Storage Temperature: -40°C to +90°C 1.5.4 GPS Performance 1.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 7 1.5.5 Interfaces 1.5.5.1 GPS 18 Electrical Characteristics • GPS 18 USB: USB 2.0 ful l-speed pr otocol com patible, as well as USB 1.1 full -speed prot ocol. • GPS 18 PC and LVC: TIA-232-F (R S-232) compatible asynchronous recei ver.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 8 2 GPS 18 LVC & GPS 18-5H z WIRING AND PINOUTS The GPS 18 LVC/ 18-5Hz interfaces to a serial port. T he unit accepts TIA-232-F (RS -232) level inputs an d transmit s voltage level s from ground t o the input voltage, TIA-232-F (RS -232) pola rit y.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 9 Figure 2. PDA Serial Port Interc onnection Figure 3. Basic NMEA Device Interconnection.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 10 3 MECHANICAL CHARACTERI STICS & MOUNTING The central threaded recess acce pts a metric M3 th reade d bolt.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 11 Figure 5. GPS 18 Suction Cup Mount Center Hole Dimensions Figure 6. GPS 18 Flush Mount Dimensions Figure 7.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 12 4 GPS 18 PC, GPS 18 LVC, & G PS 18-5Hz SOFTWARE INTERFACE The interface pr otocol de sign of t he GPS 18 PC , LVC, and GPS 18-5Hz p roducts i s based on t he National Marine Electronics Association’s NM E A 0183 ASC II interface specification.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 13 4.1.2 Sensor Initialization Information (PGRMI) The $PGRMI sentence provides information used to initialize the GPS sensor’s set position and time used for satellite acquisition.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 14 4.1.4 Additional Sensor Configuration Information (PGRMC1) The $PGRMC1 s entence provides a dditional i nformati on used to co nfigure the GPS sensor o peration. Configuration parameters are stored in non-volatile memory and retained between power cycles.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 15 4.2 TRANSMITTED NMEA 0183 SENTENCES The subsequ ent paragraph s define the sentences that can be tran smitted by th e GPS 18 PC and LVC. 4.2.1 Sentence Transmission Rate Sentences are transmitted with respect to the user selected baud rate.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 16 4.2.2 Transmitted Time The GPS sensor outputs UTC (Coordinated Universal Time) date and time of day in the transmitted sentences. Before the initial positio n fix, the on-board clock provides the date and time of day.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 17 4.2.4 Global Positioning System Fix Data (GGA) $GPGGA,<1>,< 2>,<3>,<4>,<5>,< 6>,<7>,< 8>.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 18 4.2.7 Recommended Minimum Specific GPS/TRANSIT Data (RMC) $GPRMC,<1>,< 2>,<3>,<4> ,<5>,<6>,<7>.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 19 4.2.10 Estimated Error Information (PGRME) $PGRME,<1>,M,<2>,M ,<3>,M*h h<CR><LF> <1> Estimated horizontal position error (HPE), 0.0 to 999.9 meters <2> Estimated vertical position error (VPE), 0.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 20 4.2.14 DGPS Beacon Information (PGRMB) NOTE: The GPS 18 products do not support PGRMB at th is time. $PGRMB,<1>,< 2>,<3>,<4> ,<5> ,K,<6> ,<7>,<8>* hh<CR><LF> <1> Beacon tune frequency, 0.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 21 The default pulse widt h is 100 m s, however; it may be pr ogrammed i n 20 ms increm ents between 20 ms and 180 m s as described i n $PGRMC Section 4.1 .2 Senso r Initial ization Inform ation (PGR MI) , field <1 3>.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 22 34 GUX 1 ASTRO–Guadalcanal Island 35 HJORSEY 1955–Iceland 36 HONG K ONG 1963–Hong Kong 37 INDIAN–Ba nglades h, I ndi a, Ne pal 3.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 23 73 OLD HAW AIIAN–Mean Va lue 74 OMAN–Om an 75 PICO DE L AS NIEVES–C anary Isl ands 76 PITCAIRN ASTRO 1967– Pitcairn Island 77 PU.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 24 APPENDIX B: BINARY PHASE OUTPUT FORMAT In binary phase output mode, GPS 18 series products will transmit two types of packets once per second. One record con tains primarily pos t-process informati on such as po sition and velocity information.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 25 Satellite Data Record The satellite data has a record ID of 0x 72 with 84 (0x54) data b ytes.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 26 The USB Packet for the Satellite Record looks like: - 0x72 (Record ID – single byt e ) - 0x54 (Number of data by t es – sin gl e byt.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 27 Receiver Measurement Record typedef struct { unsigned long cycles; double pr; unsigned int phase; char slp_dtct; unsigned char snr_dbhz;.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 28 DLE and ETX bytes: Sample C code to receive t he two records shoul d filter DLE and ETX byte s as describe d below: typedef enum { DAT, .
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 29 APPENDIX C: CHANGING THE BAUD RATE IN GARMIN MODE In certain cases, you may need to cha nge the default ba ud rate of your Ga rmin GPS recei ver while in Garmin mode. Follow these steps to temporarily ch ange the baud rate.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 30 APPENDIX D: GPS 18 PC/ LVC/18-5Hz & WINDOWS SERIAL MOUSE ISSUE Problem: It is possible for Windows to incor rectly in terpret the NMEA 0183 output of the GPS 18 PC as the output of a Microsoft Serial Ba llPoint M ouse.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 31 4. Select the Serial Port to which the GPS 18 is connected. Select Auto to have the program aut omaticall y determine the Baud Rate, or select Manual to manually select the Baud Rate of the GPS 18.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 32 APPENDIX E: SENSOR CO NFIGURATION SOFTWARE SNSRCFG configures the GPS sensors based on user-sel ected parameters.
GPS 18 Technical Specif ications (190-00307- 00) Rev. D Page 33 File Menu The File Menu allows you to open, sav e, and print sens or configurations. The items in the File Men u work like most Wind ows-based programs .
For the latest free softw are up dates (exclu ding map data) th roughout t he life of yo ur Garmin products, visit the Garmin Web site at ww w.g armin.com. © Copyright 2004–2005 Garmin Ltd. or its subsidiaries Garmin International, Inc. 1200 East 151 st Street, Olathe, Kansas 66062, U.
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