Etek Navigation GM-168 User manual

GM-168 USER’S MANUAL
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Version: 2
Please read this manual before operating the unit
©ETEK NAVIGATION, INC.
ETEK NAVIGATION, INC.
TEL: [phone] FAX: [phone]
10F, NO. 105,Xicheng Rd., BanqiaoCity,
Taipei County220,Taiwan(R.O.C.)
E-Mail: [e-mail]
http://www.etek.com.tw

GM-168 USER’S MANUAL
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Content
Installation..............................................................................................................................................................................................3
Troubleshooting ....................................................................................................................................................................................5
GM-168 Introduction ..........................................................................................................................................................................6
GM-168 Key Feature...................................................................................................................................................................6
PossibleApplication .....................................................................................................................................................................6
Familiarize your GM-168...................................................................................................................................................................6
Dimensions......................................................................................................................................................................................6
Interface ..........................................................................................................................................................................................7
Water-proof housing with magnet on the bottom................................................................................................................7
LED Light.......................................................................................................................................................................................7
GM-168 Computer/Lap top and handheld device cable....................................................................................................7
Software Interface................................................................................................................................................................................9
NMEA Protocol .............................................................................................................................................................................9
NMEA Messages ...........................................................................................................................................................................9
GLL –Geographic Position –Latitude/Longitude ..............................................................................................................9
GGA –Global Positioning System Fix Data.......................................................................................................................10
VTG –Course over Ground and Ground Speed...............................................................................................................10
RMC –Recommended Minimum Specific GNSS Data...................................................................................................11
GSA –DOP and Active Satellites............................................................................................................................................11
GSV –Satellites in view............................................................................................................................................................12
PFST,FOM –Position figure of merit..................................................................................................................................12
PFST,PPS –PPS signal.............................................................................................................................................................13

GM-168 USER’S MANUAL
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Installation
Step I：Check your GM-168 package
Please check the GM-168 package. If any items are missing or damaging, please contact our distributor
immediately.
The standard package of GM-168contains:
lGM -168 Receiver
lGM -168 Driver & Utility CD
lWarranty Card
lQuick Installation Guide
lRS-232 cable or USB cable
With different brand/type of handheld device, the GM-168 receiver needs to use different type of car charger.
Our company provides all kinds of car chargers, please refer to the section of GM-168 car chargers and cables on
page 7. If the GM-168 receiver you purchased provides a car charger, please make sure it is suitable for your
handheld device.
Step II：Connect GM-168 receiver to PC/Lap top or handheld device
lUsing RS-232 cable: please follow the illustration as below.
lUsing USB connector: please follow the illustration as below. Before the USB connector plugs in
your PC/Lap top, please have your USB Driver Installation ready. (See the USB Driver installation
guide for detail information). Remember to plug in the USB connector after your PC/Lap top started
properly. Otherwise, your PC/Lap top operating system might judge GM-168 as a mouse and affect
the normal operation.
To DB-9 port on PC/Lap top
To USB port on PC/Lap Top

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lUsing car charger: Please follows the illustration as below. You have to plug in the connector into Car
Socket in order to have power supply for bothGM -168receiver and handheld device.
Step III：Check if the LED is flashing.
Once your PC/Lap top or car charger supplies power, the GM-168receiver starts to provide the positioning
function. At meantime, the LED will be flashing and it means GM -168 is operating.
To USB port on PC/Lap top
To Input/output port of
handheld device
Connect to Car Socket

GM-168 USER’S MANUAL
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Troubleshooting
When your GM-168 receiver could not operate, please follow the instruction to do the troubleshooting as below.
1. GM -168 receiver’s LED is not flashing
lIt means GM-168does not have power supply. Please check if the connector plugs in properly as the
step II.
2. GM -168 receiver’s LED is flashing, but the connection between GM -168receiver and the E-map can not be
established. Please make sure the settings of COM Port Number and Baud rate are correct.
lMost of E-map provides scan function to search COM Port. Please scan it for the correct COM Port
number that GM-168 receiver is utilizing.
lIf a RS232 cable is used to connect to PC/Lap top, the COM Port number would COM1 usually.
lThe default Baud rate is 4800.
lIf a USB cable is used to connect to PC/Lap top, please make sure the UBS driver is installed
successfully.

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GM-168 Introduction
The GM-168is an outstanding high sensitivity GPS receiver. Its excellent performance easily
conquers the most difficult tasks.
In addition, it provides various functions to meet customers’ demand.
GM -168 employs uNav’s powerful GPS solution. It provides marvelous navigation performance under dynamic
conditions in areas with limited sky view like urban canyons. It also has high sensitivity for weak signal operation
without compromising accuracy. Undoubtedly, GM-168is the best choice for you.
Market Leading System Performance
Ultra-low, user configurable power management makes GM-168 the lowest power consuming, complete 12-channel
iGPS receiver on the market. Nevertheless, there are no compromises in performance. The iGPS receiver has a
navigation sensitivity as low as –150dBm making it applicable even for extremely demanding applications and
environments.
GM-168 Key Feature
qThin module form factor –45mm(L) x 45mm(W) x 8.5mm(H)
qVery Fast TTFF
qSensitivity: -150dBm (Tracking)
qiTALK and NMEA0183 protocols
qAccurate 1PPS timing output
qiGPS-8MBit Flash Memory
PossibleApplication
qMapping devices for PC & Pocket PC
qPersonal Navigation or touring devices
qAVL and Location-Based service system
qData logging for marine Navigation
qSupport 1pps output for timer
qTracking devices/system
qMileage Management
qFleet Management
qCar Navigation
Familiarize your GM-168
Dimensions
Length：64 mm Width：57 mm Height：16.5 mm Weight：85+/-5 gram

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6-pin female connector
2 meters long wire
Interface
As shown in the illustration on the right, the length of the wire on
GM -168 receiver is 2 meters. There is a 6-pin connector for the
connection to PC/Lap top or handheld device. The ping assignment
is shown below.
Ping No. Function
11 PPS
2Tx TTL
3DC 5V
4RS232 Rx
5GND
6RS232 Tx
Water-proof housing with magnet on the bottom
There are 4 magnets on the bottom side of GM -168receiver for adsorbing on your car. The housing of GM-168
receiver has waterproof, it can avoid the water permeates your GM-168receiver while you adsorb it outside of the
car.
LED Light
There is an LED light near the output cable on the back of GM -168 receiver. When the GM-168 supplied 5V DC
power, the LED will be flashing. It means GM-168 receiver starts to provide the positioning function.
GM-168 Computer/Lap top and handheld device cable
Following table lists each kind of cables for connecting different type of PC/Lap top or handheld device.
Category Model Number Type
RS232 cable GM -168-RS232C RS232 as I/O, power by USB
USB cable GM -168-USBC USB for both I/O and power

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GM -168-CA-ACER N20 ACER N20
GM -168-CA-ACER S60 ACER S60
GM -168-CA-ASUSA600 ASUSA600
GM -168-CA-ASUSA620 ASUSA620
GM -168-CA-CASIO E115 Casio E115
GM -168-CA-CASIO E125/EM500 Casio E125/EM500
GM -168-CA-CASIO E200 Casio E200
GM -168-CA-Dell Axim X3 Dell Axim X3
GM -168-CA-Dell Axim X5 Dell Axim X5
GM -168-CA-Eten P300 Eten P300
GM -168-CA-I-PAQ 2200i/38xx/39xx I-PAQ 2200i38xx/39xx series
GM -168-CA-I-PAQ 36xx/37xx I-PAQ 36xx/37xx series
GM -168-CA-Mitac Mio 338/528 Mitac Mio 338/528
GM -168-CA-NEC Pocket PC NEC Pocket PC
GM -168-CA-O2 XDA II/T-Mobile MDA O2 XDA II/T-Mobile MDA
GM -168-CA-O2 XDA/T-Mobile MDA O2 XDA/T-Mobile MDA
GM -168-CA-Palm 500/505/T3 Palm 500/505/Tungsten T3
GM -168-CA-Palm Vx Palm Vx
GM -168-CA-Siemens LOOX Siemens LOOX
GM -168-CA-Sony N seriesSony N series
GM -168-CA-Sony T series Sony T series
GM -168-CA-Toshiba e330/e740 Toshiba e330/e740
GM -168-CA-Toshiba e400 Toshiba e400
GM -168-CA-Toshiba e570 Toshiba e570
GM -168-CA-Toshiba e800 Toshiba e800
GM -168-CA-Yakumo Delta 300 Yakumo Delta 300
Handheld device cable
Remark:
While using the
GM -168 with handheld
device, Car charger
would supply power for
both GM-168 and
handheld device
GM -168-CA-Yakumo Omnikron Yakumo Omnikron
RS
-
232 cable
USB cable
Car charger

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Software Interface
NMEA Protocol
GM -168receiver currently supported 21 NMEA commands and 7 NMEA messages. The NMEA commands include
NMEA, START, STOP, STORE, RESTORE, AUTOSTART, FIXRATE, DATUM, PWRDOWN, PPSMODE,
SURVEYLEN, CABLEDEL, PPSPOS, PULSEPOS, PULSELEN, INITAID, ALTAID, SETLIMIT, SYNCMODE,
SW, and HW. The respond messages include GPGLL, GPGGA, GPVTG, GPRMC, GPGSA, GPGSV, and
“PFST,FOM”.
NMEA Messages
The NMEA-0813 message consists of fields as following:
$GP<message id>,<data field>,<data field>,,, ..*<checksum><CR><LF>
Message starts with ‘$GP’ followed by message id field. Message data fields are separated by commas ( , ) and the
message ends after checksum field and carriage return <CR> and line feed <LF> control characters. Delimiter ‘*’
precedes the checksum field. Note that data fields may be NULL (missing). Null data fields contain no characters but
are still separated by commas, for example:
$GPGGA,134158.48,6016.3072,N,02458.3788,E,1,08,1.2,,,,,,0000*1E
GLL –Geographic Position –Latitude/Longitude
Latitude and Longitude, UTC time of fix and status.
Format: $GPGLL,xxmm.dddd,<N|S>, yyymm.dddd,<E|W>,hhmmss.dd,S,M*hh<CR><LF>
Example: $GPGLL,6016.3073,N,02458.3791,E,134157.48,A,A*26
Parameter Description Example
xxmm.dddd Latitude, xx = degrees, mm = minutes, dddd = decimal part of minutes 60 deg.
16.3073 min.
<N|S> Either character N or character S,
N = North, S = South North
yyymm.dddd Longitude, yyy = degrees, mm = minutes
dddd = decimal part of minutes 24 deg. 58.3791 min
<E|W> Either character E or character W,
E = East, W = West East
hhmmss.dd UTC time, hh = hours, mm = minutes, ss = seconds
dd = decimal part of seconds 13:41:51.48
SStatus indicator, A = valid, V = invalid Valid
MMode indicator, A = autonomous, N = data not valid Autonomous
hh Check sum 26

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GGA –Global Positioning System Fix Data
Time, position and fix related data for a GPS receiver.
Format:$GPGGA,hhmmss.dd,xxmm.dddd,<N|S>,yyymm.dddd,<E|W>,v,ss,d.d,h.h,M,g.g,M,a.a,xxxx*hh<CR><LF>
Example: $GPGGA,134829.48,1126.6639,S,11133.3299,W,1,07,1.0,,,,,,*15
Parameter Description Example
hhmmss.dd UTC time, hh = hours, mm = minutes, ss = seconds,
dd = decimal part of seconds 13:48:29.48
xxmm.dddd Latitude, xx = degrees, mm = minutes,
dddd = decimal part of minutes 11 deg. 26.6639 min.
<N|S> Either character N or character S,
N = North, S = South South
yyymm.dddd Longitude, yyy = degrees, mm = minutes,
dddd = decimal part of minutes 111 deg. 33.3299 min.
<E| W> Either character E or character W,
E = East, W = West West
vFix valid indicator, 0=Fix not valid, 1=Fix valid Fix valid
ss Number of satellites used in position fix,
00-12. Fixed length 7 satellites
d.d HDOP –Horizontal Dilution Of Precision HDOP = 1.0
h.h Altitude (mean-sea-level, geoid)
MNULL (missing)
g.g NULL (missing)
MNULL (missing)
a.a NULL (missing)
xxxx NULL (missing)
hh Check sum 15
VTG –Course over Ground and Ground Speed
Course and speed
Format: $GPVTG,h.h,T,m.m,M,s.s,N,s.s,K,M*hh<CR><LF>
Example: $GPVTG,202.60,T,,,0.38,N,0.7,K,A*0D
Parameter Description Example
h.h Heading 202.60
TDegrees (heading units). Degree
m.m Magnetic heading. Currently NULL (missing).
MDegrees. Magnetic heading units.
Currently NULL (missing).
s.s Speed, knots. Speed = 0.38
NKnots (Speed unit) Knots
s.s Speed, km/h. Speed = 0.7
Kkm/h (Speed units). km/h
MMode indicator, A = autonomous, N = data not valid Autonomous
hh Check sum 0D

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RMC –Recommended Minimum Specific GNSS Data
Time, date, position, course and speed data.
Format: $GPRMC,hhmmss.dd,S,xxmm.dddd,<N|S>,yyymm.dddd,<E|W>,s.s,h.h,ddmmyy,d.d,
<E|W>,M*hh<CR><LF>
Example: $GPRMC,134829.486,A,1126.6639,S,11133.3299,W,58.31,309.62,110200,,,A*14
Parameter Description Example
hhmmss.dd UTC time, h = hours, mm = minutes, ss = seconds,
dd = decimal part of seconds 13:48:29.486
SStatus indicator, A = valid, V = invalid Valid
xxmm.dddd Latitude, xx = degrees, mm = minutes,
dddd = decimal part of minutes 11 deg.
<N|S> Either character N or character S,
N = North, S = South 26.6639 min.
yyymm.dddd Longitude, yyy = degrees, mm = minutes,
dddd = decimal part of minutes 111 deg. 33.3299 min.
<E|W> Either character E or character W,
E = East, W = West West
s.s Speed, knots. 58.31 Knots
h.h Heading 309.62 deg.
ddmmyy Date, dd = date, mm = month, yy = year 11th, Aug. 2000
d.d Magnetic variation
<E|W> Declination. Either character E or character W,
E = East, W = West
MMode indicator, A = autonomous, N = data not valid Autonomous
hh Check sum 14
GSA –DOP and Active Satellites
GPS receiver operating mode, satellites used in the navigation solution reported by the GGA sentence, and DOP values.
Format: $GPGSA,a,b,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,p.p,h.h,v.v*hh<CR><LF>
Example: $GPGSA,A,3,03,15,17,18,22,23,,,,,,,4.7,3.7,2.9*37
Note:
Parameter Description Example
aMode: M = Manual, forced to operate in 2D or 3D mode. A = Automatic,
allowed to automatically switch 2D/3D. Automatic
bMode: 1 = Fix not available, 2 = 2D, 3 = 3D 3D
xx ID (PRN) numbers of GPS satellites used in solution 03,15,17,18,
22,23
p.p PDOP PDOP = 4.7
h.h HDOP HDOP = 3.7
v.v VDOP VDOP = 2.9
hh Check sum 37

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GSV –Satellites in view
Number of satellites in view, satellite ID (PRN) numbers, elevation, azimuth, and SNR value. The information for four
satellites maximum per one message, additional messages up to maximum of eight sent as needed. The satellites are in
PRN number order. Before a position fix is acquired the information contains only the SNR (signal to noise ratio) value.
After a fix is acquired, also the elevation and azimuth angles are added. Note that there can be also “theoretical”
satellites in the GSV message. These are satellites of which the angles (elevation, azimuth) are known but for some
reason, e.g. due to an obstruction, have not been found by iTrax02. The
SNR value for these satellites is therefore zero.
Format: $GPGSV,n,m,ss,xx,ee,aaa,cn,…………. ,xx,ee,aaa,cn*hh<CR><LF>
Example:
$GPGSV,4,1,14,03,66,207,50,08,09,322,44,11,01,266,42,14,00,155,00*79
$GPGSV,4,2,14,15,41,088,48,17,21,083,44,18,57,087,51,21,57,173,50*78
$GPGSV,4,3,14,22,05,203,00,23,52,074,49,26,17,028,44,27,00,300,00*79
$GPGSV,4,4,14,28,32,243,00,31,48,286,00*70
Note: There are 14 satellites in view. The examples in following table only explain the information of satellite No.03 on
the first message.
Parameter Description Example
nTotal number of messages, 1 to 9 4 messages
mMessage number, 1 to 9 Message No.1
ss Total number of satellites in view 14 satellites
xx Satellite ID (PRN) number No.03
ee Satellite elevation, degrees 90 max 66 deg.
aa Satellite azimuth, degrees True, 000 to 359 207 deg.
cn SNR ( C/No) 00-99 dB-Hz. zero when not tracking 50 dB-Hz
hh Check sum 79
PFST,FOM –Position figure of merit
Figure of merit (FOM) value for the position fix. Indicates the accuracy of the position in meters. The FOM value
cannot be calculated before at least one fix has been made with more than four observations (five satellites, or four
satellites and an altitude aid); before that a value “–1” is reported, indicating that FOM is not available yet. After this
the FOM value is always available the only exception being the altitude aiding modes when a fix has been calculated
using three satellites.
Format: $PFST,FOM,n*hh<CR><LF>
Example: $PFST,FOM,3*66
Parameter Description Example
nPosition FOM value,
i.e. the position accuracy in meters. 3 meters
hh Check sum 66

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PFST,PPS –PPS signal
The pulse per second message. Indicates the parameters of the PPSpulse that will shortly be outputted. Provides the
current GPS time and timing correction of the coming PPS pulse.
Format: $PFST,PPS,wwww,tttttt,n,xxxx*hh <CR><LF>
Example: $PFST,PPS,1161,309566,9,495*67
Parameter Description Example
wwww GPS Week, i.e. number of full weeks elapsed since midnight 5-6 January
1980. 1161 weeks
tttttt Time of Week (seconds from the beginning of the current GPS week). 309566 sec.
n Number of satellites used when calculating the solution. 9 satellites
xxxx Short-time
pulse offset of the physical PPS pulse signal (units of 0.01 ns, in
range of approx. -15.3 .. 15.3 ns). The correct pulse time can be calculated
by subtracting this offset from the physical PPS pulse instant.
4.95 ns
hh Check sum 67