User Manual – Smart OS Positioning Opertative
Contents
1. Install the bracket fix the handheld to the bracket open the handheld to connect the Bluetooth then you can do the setting of the instrument Rover As a standard feature the receiver incorporates a built in GSM modem Mount the different items as shown on the above Figure including the receiver the range pole and the field terminal with its mounting bracket 28 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH How to measure the antenna height The height of receiver is 78mm the diameter is 208mm and the height from the center of the sealed rubber ring to the bottom is 47mm The antenna height is conventionally defined as the vertical height from the phase centre to the ground surveyed point the distance h in the follow fig It is not possible to measure it directly you have to measure other reachable heights the distances a and s in fig The distance a is the vertical height from the ground to the mainframe s bottom bottom of antenna the distance s is measured from the ground surveyed point to the middle of the rubber ring and is called bottom of notch You have to choose the measuring method according to the used software 29 K North Group LTD User Manual Smart OS Positioning Opertative System ech ANORTH Surveying and Positioning Systems Information Sales info northgps com Technical Support support n2. Position error statistics Number of SVs in view PRN elevation azimuth and SNR Heading from True North Time position position type and DOP values Time synchronized position position type and DOP values Local coordinate position output Projection type Time locator vector type and DOP values Heading Information Position Velocity and Time Rate of turn Actual track made good and speed over ground UTC day month and year and local time zone offset To enable or disable the output of individual NMEA messages do one of the following e Create an application file in the GPS Configurator software that contains NMEA output settings and then send the file to the receiver e Add NMEA outputs in the Serial outputs tab of the GPS Configurator software and then apply the Settings 1 Common Message Elements Each message contains e A message ID consisting of SGP followed by the message type For example the message ID of the GGA message is SGPGGA e A comma e A number of fields depending on the message type separated by commas e An asterisk e A checksum value 14 K North Group LTD User Manual Smart OS Positioning Opertative System ANORTH Below is an example of a simple message with a message ID SGPGGA followed by 13 fields and a checksum value SGPGGA 172814 0 3723 46587704 N 12202 26957864 W 2 6 1 2 18 893 M 25 669 M 2 0 0031 4F 1 1 Message values The following values can be fo
3. 0 5 to 99 9 HDOP Horizontal dilution of precision 0 5 to 99 9 VDOP Vertical dilution of precision 0 5 to 99 9 Checksum 2 4 GST Position Error Statistics An example of the GST message string is shown below Following table describes the message fields SGPGST 172814 0 0 006 0 023 0 020 273 6 0 023 0 020 0 031 62 17 User Manual Smart OS Positioning Opertative System A NORTH Meaning UTC of position fix RMS value of the pseudorange residuals includes carrier phase residuals during periods of RTK float and RTK fixed processing Error ellipse semi major axis 1 sigma error in meters Error ellipse semi minor axis 1 sigma error in meters Error ellipse orientation degrees from true north Latitude 1 sigma error in meters Longitude 1 sigma error in meters Height 1 sigma error in meters 2 5 GSV Satellite Information The GSV message string identifies the number of SVs in view the PRN numbers elevations azimuths and SNR values An example of the GSV message string is shown below Following table describes the message fields SGPGSV 4 1 13 02 02 213 03 3 000 11 00 121 14 13 172 05 67 Meaning Total number of messages of this type in this cycle Message number Total number of SVs visible SV PRN number Elevation in degrees 90 maximum Azimuth degrees from True North 000 to 359 SNR 00 99 dB null when not tracking Information about second SV same format as fields 4 7 Informa
4. 0500 MHz 442 5125 MHz 458 0125 MHz b 418 0125 MHz 10 438 0125 MHz 11 463 0125 MHz 423 0125 MHz 11 443 0125 MHz North Group LTD K 457 5125 MHz A 417 5125 MHz 13 463 5125 MHz 423 5125 MHz 13 443 5125 MHz 457 0125 MHz 417 0125 MHz 14 437 0125 MHz 420 0000 MHz 460 0000 MHz 15 440 0000 MHz 437 5125 MHz 11 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 2 1 6 Display Setup Always ON the display will remain on all the time The duration of the battery is reduced Auto OFF 1 min the display will remain on 1 min The duration of the battery is extended Auto OFF 10 min the display will remain on for 10 min the duration of the battery is the average 2 1 7 Sound Setup Sound ON The sound is active Sound OFF the sound has been deactivated 2 1 8 Tilt Setup Tilt setup set zero Press multifunctional button to set zero the horizontal and vertical angle 2 1 9 Quit setup Exit the menu and returns to main screen 2 1 10 Power OFF The receiver turns OFF 12 K North Group LTD User Manual Smart OS Positioning Opertative System ANORTH Appendix A NMEA 0183 output This appendix describes the formats of the subset of NMEA 0183 messages that are available for output by the receiver For a copy of the NMEA 0183 Standard go to the National Marine Electronics Association Website at www nmea org NMEA 0183 Outputs When NM
5. A NORTH Surveying and Positioning Systems P j gt 7 S 7 y us K d 4 IT NW Dy gt gt a ei Ba J a f Mat K TN eo d gt k ai W A MA im e x e em wm e e n lt e e emm ep e Ki emm a E gd e af WW 4 ge e ek S 4 e r lt F E 3 i R f i j l E k r 7 sr f 7 x x b G i 8 a x E i ii bas WA f gt H F r d A s e A BE L ee KE J s L Si i di l IL d tu N di Is Jt L ge t 4 A d t e a e I K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH Copyright Copyright 2007 2013 North 2007 North Group LTD All rights reserved North is trademark of North Group LTD All other trademarks are the property of their respective owners 2007 Trademarks All product and brand names mentioned in this publication are trademarks of their respective holders K North Group LTD User Manual Smart OS Positioning Opertative System ANORTH Content L CUO EE 4 1 1 Main SCF CON EE 4 1 2 GEIER 6 Ze Maln FOE 7 SN fa WE gg MODE aieea E E E E E T gais 7 EN Br AIR od cois Ui TEE 8 Peles SAU ee TI ACY EE 8 DN BE E d dE H 2 L41 BASS KNOWN mm mi a ea H KN IR e ET lO osni a aaa H E EE 10 2 14 MOBILE NETWORK sicacds ccessnneventanaecetsnanssestesnantnscencunstcossccdencensesntatsascenaeansescsueanes 10 2 TL PPS TCM ANNE cesessscsuacete a 10 215 WA Eau 11 2 1 6 Dis
6. E East GPS Quality indicator 0 Fix not available or invalid 1 Autonomous GPS fix 2 Differential floating carrier phase integer based solution RTK float 3 Differential fixed carrier phase integer based solution RTK fixed 4 Differential code phase only solution DGPS Number of satellites in fix DOP of fix Ellipsoidal height of fix M ellipsoidal height is measured in meters 2 10 PTNL PJT Projection Type An example of the PTNL PJT message string is shown below Following table describes the message fields SPTNL PJT NAD83 Conus California Zone 4 0404 51 Meaning Coordinate system name can include multiple words Projection name can include multiple coordinates 2 11 PTNL VGK Vector Information An example of the PTNL VGK message string is shown below Following Table describes the message fields SPTNL VGK 160159 00 010997 0000 161 00009 985 0000 002 3 07 1 4 M 0OB Meaning UTC of vector in hhmmss ss format Date in mmddyy format East component of vector in meters North component of vector in meters Up component of vector in meters GPS quality indicator 0 Fix not available or invalid 1 Autonomous GPS fix 2 Differential carrier phase solution RTK float 3 Differential carrier phase solution RTK fix Sch K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 4 Differential code based solution DGPS Number of satellites if fix sol
7. EA 0183 output is enabled a subset of NMEA 0183 messages can be output to external instruments and equipment connected to the North receiver serial port These NMEA 0183 messages let external devices use selected data collected or computed by the receiver All messages conform to the NMEA 0183 version 3 01 format All begin with and end with a carriage return and a line feed Data fields follow comma delimiters and are variable in length Null fields still follow comma delimiters but contain no information An asterisk delimiter and checksum value follow the last field of data contained in an NMEA 0183 message The checksum is the 8 bit exclusive OR of all characters in the message including the commas between fields but not including the and asterisk delimiters The hexadecimal result is converted to two ASCII characters 0 9 A F The most significant character appears first The following table summarizes the set of NMEA messages supported by the receiver and shows the page where detailed information about each message can be found 13 K North Group LTD User Manual Message AVR GGA GSA GST GSV HDT PTNL GGK PTNL GGK_SYNC PTNL PJK PTNL PJT PTNL VGK PTNL VHD RMC ROT VTG ZDA Smart OS Positioning Opertative System ENAS SS Function Time yaw tilt range mode PDOP and number of SVs for Moving Baseline RTK Time position and fix related data GNSS DOP and active satellites
8. ORS STREAM Shows the correction data format 2 1 4 4 MOBILE NETWORK MOBILE NET APN MOBILE NET APN testAPN Displays the Access Point Name Mobile network MOBILE NET User test User a Shows the Mobile Network users MOBILE NET Pass test Password Cea ae Shows the Mobile Network Password 2 1 4 5 PPS filename PPS Filename PPS Filename Show the name set to PPS file 10 User Manual Smart OS Positioning Opertative System Cle james 2 1 5 UHF Channel Choose between the three bands in the range of 410 470 MHz Please check the appropriate frequency to work according to the requirements of your country UHF radio transceiver with 48 pre selected channels and custom channels setup Find the option Main menu gt gt UHF channel on main menu when selected you can choose between 3 ranges of bands Each band contains 16 channels assigned to specific frequencies UHF Frequencies UHF Frequencies UHF Frequencies Channel 410 430 MHz Channel 450 470 MHz Channel 430 450 MHz ua 421 0125 MHz a 461 0125 MHz 422 0125 MHz 462 0125 MHz ei 422 5125 MHz uil 462 5125 MHz 440 0125 MHz 420 0125 MHz ei 460 0125 MHz 1 420 5125 MHz 460 5125 MHz 419 5125 MHz EES 459 5125 MHz 440 5125 MHz 439 5125 MHz 441 0125 MHz 439 0125 MHz 419 0125 MHz ib 459 0125 MHz 421 5125 MHz SE 461 5125 MHz 418 5125 MHz EE 458 5125 MHz 441 5125 MHz 438 5125 MHz 442 0125 MHz 438 0500 MHz asss Male men 458
9. e Network is connecting z WO Bars Icon Indicator of the Mobile Network strength LU H al e Waves Icon Indicator of the UHF Radio modem operation L e TX Indicates that the SmaRTK is Transmitting correction data e RX Indicates that the SmaRTK is Receiving correction data e RDY Indicates that the SmaRTK is Ready to record Raw Data for Static Post Processing e REC Indicates that the SmaRTK is Recording Raw Data for Static Post Processing 4 Battery level indicator e a Shows the Battery level up to 100 ii Charging Icon indicates that the external power is connected e ry Battery Empty Icon indicates that the battery is charging e Battery Full Icon indicates that the battery is fully charged K North Group LTD K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 1 2 Screens diagram RECEIVER MODE SMARTK e SAT ACURRACY SMARTOS 1 6 4 SMART K SETTINGS 16130 SRTK8 116 ROVER UHF NA S UHF CHANNEL Lee Gee COG DISPLAY SETUP SOUND SETUP TILT SETUP QUIT SETUP POWER OFF K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 2 Main menu 2 1 1 Receiver mode RECEIVER MODE PPS Recording Base Serial Base UHF EXT 5W PPS Recording The RTK recorded format crude raw data NOR to internal memory as static point The file will download and convert to RINEX for post proce
10. hown below Followed table describes the message fields SGPGGA 172814 0 3723 46587704 N 12202 26957864 W 2 6 1 2 18 893 M 25 669 M 2 0 0031 4F Meaning UTC of position fix Latitude Direction of latitude N North S South Longitude Direction of longitude E East W West GPS Quality indicator 0 Fix not valid 1 GPS fix 2 Differential GPS fix 16 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 4 Real Time Kinematic fixed integers 5 Real Time Kinematic float integers Number of SVs in use range from 00 to 12 HDOP Orthometric height MSL reference M unit of measure for height is meters Geoid separation M geoid separation is measured in meters Age of differential GPS data record Type 1 or Type 9 Null field when DGPS is not used Reference station ID ranging from 0000 to 1023 A null field when any reference station ID is selected and no corrections are received 2 3 GSA GNSS DOP and active satellites An example of the GSA message string is shown below Following Table describes the message fields SGPGSA lt 1 gt lt 2 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt CR gt lt LF gt Meaning Mode 1 M manual A automatic Mode 2 Fix type 1 not available 2 2D 3 3D PRN number 01 to 32 of satellite used in solution up to 12 transmitted PDOP Position dilution of precision
11. lid data 2 15 VTG Actual Track Made Good Over and Speed Over Ground An example of the VTG message string is shown below The following table describes the message fields SGPVTG T M 0 00 N 0 00 K 4E Meaning Track made good degrees true T track made good is relative to true north Track made good degrees magnetic M track made good is relative to magnetic north Speed in knots N speed is measured in knots Speed over ground in kilometers hour kph K soeed over ground is measured in kph 1 2 3 4 5 6 7 8 23 User Manual Smart OS Positioning Opertative System A NORTH 2 16 ZDA UTC Day Month And Year and Local Time Zone Offset An example of the ZDA message string is shown below The following table describes the message fields SGPZDA 172809 12 07 1996 00 00 45 Meaning UTC Day ranging between 01 and 31 Month ranging between 01 and 12 Year Local time zone offset from GMT ranging from 00 to 13 hours Local time zone offset from GMT ranging from 00 to 59 minutes Fields 5 and 6 together yield the total offset For example if field 5 is 5 and field 6 is 15 local time is 5 hours and 15 minutes earlier than GMT 24 K North Group LTD K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH Appendix B RTCM Output Generated messages Messages that are generated when you select a specific RTCM version are as follows These messages a
12. on with known coordinates or unknown coordinates attach receiver to tribrach 2 Precisely level and center the instrument 26 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 3 Set the transmitting antenna and radio using pole support is better rise the antenna as high as possible and then put the radio at suitable position PAWARNING There is sequence for the cables linking to Radiomodem 1 Affix the antenna cable to the radio 2 Affix the Power cable to the radio 3 Affix the data cable to the radio 4 Make sure the connection is right and then switch on the radio and mainframe GSM GPRS Model Mount the different items shown as the picture Base For GPRS mode is not necessary to set up the radio antenna 27 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH RTK Rover Setup Prerequisites e fa radio link is used with the base your rover should normally have been fitted with the radio module that matches the reception band covered by the radio transmitter used at the base e fa GPRS connection is used rover should normally have been fitted with the SIM card that will allow it to perform a network connection Remove the rear cover this gives access to an electronic card on which you can insert the SIM card as shown on the picture Radio Link 1 Install the pole rover and receiving antenna then power on the mainframe 2
13. orthgps com Copyright 2007 2013 North 2007 North Group LTD All rights reserved 30
14. play SOUND EE 12 po Ee ae e oy WEEN 12 ZLS Se ee i E 12 ELS CUE SOUND EE 12 2 L10 JEE Eege 12 PRU CVI EE 13 AED 25 eer a e 26 RIK B356 TT BE 26 PTR ROVER Li E 28 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 1 Operation The North SmaRTK is a GNSS RTK receiver designed to be the simplest to use and to be compatible with most platforms and communication protocols The SmaRTK receiver has a mainframe that operates with the SmartOS Operative System on board that is designed for a flexible and simple use with the main feature of being able to be upgraded to add new features over time on the same hardware Long Press 3 seconds used To turn on the SmaRTK Long Press the button The display will start show the serial number and SmartOS version and then enter to the Main Screen e e 1 1 Main screen The Main Screen shows the current RECEIVER MODE of the receiver that will be the last one that the receiver was set to Also it will show the number of locked satellites the battery power status and the Communication status 1 Can se the SmaRTK mode to see more Smartk modes see 1 2 2 Receiver mode 2 The constellations are divided into L Locked GPS Navstar Satellites G Locked GLONASS Satellites C Locked COMPASS Satellites User Manual Smart OS Positioning Opertative System A NORTH 3 Data transmitter indicator e Hourglass Icon indicates that the Mobil
15. re in the same order as they appear in the GPS Configuration software For the details of the contents of individual messages refer to the RTCM documentation Selection Message Version 2 1 3 USCG 9 3 3 RTCM RTK 2 2 2 3 3 RTK Only 2 2 2 3 3 RTCM RTK 2 3 RTK Only 2 3 RTCM RTK 2 2 RTK Only 2 2 RTCM RTK 2 1 RTK Only 2 1 RTCM RTK 3 00 Message scheduling The frequency at which messages are generated when they are enabled in a base receiver is as follows Frequency Every second The 10th second after the first measurement then every 10 seconds after that Every second Every second Every second The 5th second after the first measurement then every 10 seconds after that The 4th second after the first measurement then every 10 seconds after that The 4th second after the first measurement then every 10 seconds after that 59 sub 13 The 5th second after the first measurement then every 10 seconds after that 1004 Every second 1006 Every 10 seconds 1008 Every 10 seconds 1013 Every 300 seconds fis K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH Appendix C Setting up RTK system RTK Base Setup Prerequisites e You need a tripod and a tribrach to install the base e To power the radio you need a standard 12 V DC battery A car motorcycle or other kinds can be used e Datalink UHF Radiomodem Mount the different items shown as the picture 1 Put tripod on a locati
16. s Synchronized 1 Hz positions even in Low Latency mode An example of the PTNL GGK_SYNC message string is shown below The following table describes the message fields 19 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH SPTNL GGK_SYNC 172814 00 071296 3723 46587704 N 12202 26957864 W 3 06 1 7 EHT 6 777 M 48 Meaning UTC of position fix Date Latitude Direction of latitude N North S South Longitude Direction of Longitude E East W West GPS Quality indicator 0 Fix not available or invalid 1 Autonomous GPS fix 2 Differential floating carrier phase integer based solution RTK float 3 Differential fixed carrier phase integer based solution RTK fixed 4 Differential code phase only solution DGPS Number of satellites in fix DOP of fix Ellipsoidal height of fix M ellipsoidal height is measured in meters Note The PTNL GGK_SYNC message is longer than the NWEA 0183 standard of 80 characters 2 9 PTNL PJK Local Coordinate Position Output An example of the PTNL PJK message string is shown below Table A 9 describes the message fields SPTNL PJK 010717 00 081796 732646 511 N 1731051 091 E 1 05 2 7 EHT 28 345 M 7C Meaning UTC of position fix Date Northing in meters Direction of Northing will always be N North Easting in meters K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH Direction of Easting will always be
17. s G64 COO RDY The SmaRTK is ready to use to post process Now if you want to start post processing press the button to start the post process appear as follows For more information to downloading data for post processing view the user manual Quick Operation Guide Smart Os 21 3 Sat Accuracy SAT ACCURACY Ss SAT ACCURACY SAT ACCURACY Po 0 Ho 0 V0 0 P0 0 H0 0 V0 0 PDOP HDOP and VDOP respectively K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 2 1 4 Settings 2 1 4 1 Base known BASE KNOW LAT Auto Base BASE KNOWN LAT 00 00 00 0000 N Can be N or S BASE KNOW LONG Auto Base BASE KNOWN LONG SETTINGS 00 00 00 0000 W Can be W or E BASE TX PROTOCOL Indicates the data transmission protocol of the base 2 1 4 2 Autocaster AUTOCASTER IP AUTOCASTER IP dee Server Address Auto Caster can be IP o Web SET direction d NGS AUTOCASTER PORTS AUTOCASTER Ports Ports Tx and Rx from Auto caster server 0000 0000 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH GC 3 2 1 4 3 CORS see SE CORS CASTER IP ke E L Server Address CORS can be IP o Web direction CORS TX PORT CORS TX PORT Ports Tx from CORS server 0000 0000 SETTINGS HE CORS USER Shows the CORS users CORS PASSWORD Shows the CORS password users C
18. ssing Bluetooth is on For more information see the 2 1 2 PPS Recording Rover Network The RTK transmits correctly data in RTCM 3 format This mode would be displayed and you will see an hourglass icon The internal modem is connecting to the CORS server through the Mobile Network Bluetooth is on Rover AutoCaster The RTK is set to Rover Mode GPRS modem is On The Rover receives corrections via GPRS from AutoCaster server Bluetooth is on Rover UHF The RTK is set to Rover Mode UHF modem is On in receive mode The UHF receives corrections from radio modem on mode transparent Bluetooth is on Base AutoCaster The RTK is set to Base Mode GPRS modem is On The GPRS modem transmit corrections to Auto caster server in RTCM3 format Base UHF INT 2W The RTK is set to Base Mode Turn On the UHF set to transmission mode with an output of 2W The RTK is set to Base Mode Turn On the UHF set to transmission mode with an output of 0 5W This mode is to put the U CAST 25 45w Amplifier in the TNC port Base Serial The RTK is set to Base Mode This mode is for connection to a radio from another brand Pacific Crest etc Or PC to operate as CORS K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH 2 1 2 PPS Recording For post process is necessary to have the SmaRTK in PPS Recording mode You will have on your main screen as follows 99 L
19. tion about third SV same format as fields 4 7 Information about fourth SV same format as fields 4 7 2 6 HDT Heading from True North The HDT string is shown below and the following table describes the message fields SGPHDT 123 456 T 00 18 K North Group LTD K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH Meaning Heading in degrees T indicates heading relative to True North 2 7 PTNL GGK Time Position Position Type DOP An example of the PTNL GGK message string is shown below The following table describes the message fields SPTNL GGK 172814 00 071296 3723 46587704 N 12202 26957864 W 3 06 1 7 EHT 6 777 M 48 Meaning UTC of position fix Date Latitude Direction of latitude N North S South Longitude Direction of Longitude E East W West GPS Quality indicator 0 Fix not available or invalid 1 Autonomous GPS fix 2 Differential floating carrier phase integer based solution RTK float 3 Differential fixed carrier phase integer based solution RTK fixed 4 Differential code phase only solution DGPS Number of satellites in fix DOP of fix Ellipsoidal height of fix M ellipsoidal height is measured in meters Note The PTNL GGK message is longer than the NWEA 0183 standard of 80 characters 2 8 PTNL GGK_SYNC Time Synchronized Position Position Type DOP The PTNL GGK_SYNC message has the same format as the PTNL GGK message but output
20. und in NMEA messages that the receiver generates Latitude and longitude Latitude is represented as ddmm mmmm and longitude is represented as dddmm mmmm where e dd or ddd is degrees e mm mmmm is minutes and decimal fractions of minutes Direction Direction north south east or west is represented by a single character N S E or W Time Time values are presented in Universal Time Coordinated UTC and are represented as hhmmss cc where e hh is hours from 00 to 23 e mm is minutes ees is seconds e cc is hundredths of seconds 2 NMEA Messages When NMEA 0183 output is enabled the following messages can be generated 2 1 AVR Time Yaw Tilt Range for Moving Baseline RTK The AVR message string is shown below and the follow table describes the message fields SPTNL AVR 181059 6 149 4688 Yaw 0 0134 Tilt 60 191 3 2 5 6 00 15 K North Group LTD User Manual Smart OS Positioning Opertative System Meaning U TC of vector fix Yaw angle in degrees Yaw Tilt angle in degrees Tilt Reserved Reserved Range in meters O On OU BP WN k Quality indicator 0 Fix not available or invalid 1 Autonomous GPS fix 2 Differential carrier phase solution RTK Float 3 Differential carrier phase solution RTK Fix 4 Differential code based solution DGPS PDOP Number of satellites used in solution 2 2 GGA Time Position and Fix Related Data A NORTH An example of the GGA message string is s
21. ution DOP of fix M Vector components are in meters 2 12 PTNL VHD Heading Information An example of the PTNL VHD message string is shown below Following table describes the message fields SPTNL VHD 030556 00 093098 187 718 22 138 76 929 015 0 033 0 006 3 07 2 4 M 22 Meaning UTC of vector in hhmmss ss ddmmyy format Date in mmddyy format Azimuth A Azimuth ATime Vertical angle AVertical ATime Range ARange ATime Quality indicator O 0 N OU P WN FE 0 Fix not available or invalid 1 Autonomous GPS fix 2 Differential carrier phase solution RTK float 3 Differential carrier phase solution RTK fix 4 Differential code based solution DGPS Number of satellites used in solution PDOP 2 13 RMC Position Velocity and Time The RMC string is shown below and following table describes the message fields SGPRMC 123519 A 4807 038 N 01131 000 E 022 4 084 4 230394 003 1 W 6A Meaning UTC of position fix Status A active or V void 22 K North Group LTD User Manual Smart OS Positioning Opertative System A NORTH Latitude Longitude Speed over the ground in knots Track angle in degrees True Date Magnetic variation The checksum data always begins with 2 14 ROT Rate of Turn The ROT string is shown below and Table A 14 describes the message fields SGPROT 35 6 A 4E Meaning Rate of turn degrees minutes indicates bow turns to port A Valid data V Inva
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