G-Mouse GPS User Manual
GPS GGM308U
USB Connector
Version 1.01 2004 / 09 / 16
i
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1 OVERVIEW
Congratulation on your purchase of Altina, which manufacture and provide various
GPS applications. Altina’s GGM308U GPS Receiver provides you various applications
such as car navigation, marine navigation, mapping, surveying, security, agriculture and so
on. It communicates with device (such as PocketPC or notebook) via compatible
dual-channel through RS-232 or TTL and saves satellite data by built–in backup memory.
Low power consumption technology enables GGM308U and your device to save more
operating power. Furthermore, GGM308U can track up to 12 satellites at a time,
re-acquire satellite signals in 100ms and update position data every second.
Trickle-Power allows the unit to operate a fraction of the time, and Push-to-Fix permits user
to have a quicker position fix even though the receiver stays off.
2 PRODUCT FEATURE
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SiRF Star Ⅱe/LP ”High Performance and Low Power Consumption Chipset
Integrated ARM7TDMI CPU
Cold Start : within 45 seconds.
A rechargeable battery sustains internal clock and memory and can be recharged
during normal operation.
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All-in-View 12-channel parallel processing.
Support NMEA 0183 V2.2 command
Optional communication levels, RS-232 and TTL
Reacquisition Time: 0.1 seconds
Support Accurate 1PPS Output Signal Aligned with GPS Timing
Water proof design enable receiver to continuously operate for 4 days under
1meter water deep.
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Built-in hardware Tracking Loop Processor WAAS/EGNOS Demodulator and
NDGPS/U.S. Coast Guard Beacon support
Obvious LED display status: LED provides users visible positioning status. LED
“ON” : power connected; “BLINKING”: positioned.
Differential capability utilizes real-time RTCM corrections to provide 1-5 meter
precise position accuracy.
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FLASH base program memory
3 SPECIFICATION
Key Feture
Frequency
L1, 1575.42 MHz
C/A Code
Channels
Sensitivity
1.023 MHz chip rate
12
-173 dBW
Non DGPS (Differential GPS)
Position Horizontal 5 to 25 meter CEP, without SA
Velocity
Time
0.1 meter/second, without SA
1 microsecond synchronized GPS time
DGPS (Differential GPS)
Position Horizontal 1 to 5 meter, typical
Velocity
0.05 meter/second, typical
EGNOS/WAAS
Datum
< 2.2 m, horizontal 95% of time
WGS-84
Performance
Hot start
8 sec., average
Warm start
Cold start
38 sec., average
45 sec., average
Reacquisition
GPS Protocol
GPS Output Data
0.1 sec. average
Default: NMEA 0183 V2.2 (Secondary: SiRF binary)
SiRF binary >> position, velocity, altitude, status and control ;
NMEA 0183 protocol, and supports command:
GGA, GSA, GSV, RMC, VTG, GLL (VTG and GLL are optional)
Software command setting (Default : 4800,n,8,1 for NMEA )
GPS transfer rate
Acceleration Limit
Altitude Limit
Velocity Limit
Jerk Limit
Less than 4g
18,000 meters (60,000 feet) ma
515 meters/sec. (1,000 knots) max.
20 meters/second, max
-40oC to +85oC(internal temperature).
-45oC to +100oC
Operating
Storage
Input Voltage
Power consumption
+4.75 ~ 5.5 VDC without accessories.
<80mA at 4.5- 5.5V input
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Dimension
2.32" x 1.85" x 0.82" (59.32mm x 51.28mm x 20.3mm)
60" (1500mm)
Cable Length
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4 HARDWARE
4.1. Dimension
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4.2. Output terminal and definition
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Output terminal:: USB connector
Pin definition:
Signal Name
+5V
Pin
1
2
D +
3
D -
4
Ground
4.3. USB Driver
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System Requirement
IBM, Pentium or above and other compatible PC; 16 MB and above memory; Windows
98/Me/2000; VGA Graphic Adapter.
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Installation
1. Copy entire 【GGM308 USB_Driver】folder from CD to hard disk.
2. Connect GGM308 USB connector to computer. While the computer automatically
starts the installation program, please direct the driver to the 【GGM308 USB】
folder.
3. After the installation is complete, go to 【Device Manager】and select【Ports (COM
& LPT)】to verify if a virtual COM port 【USB to Serial Port】was created.
※Notice: Verify the COM port # to start using your own navigating software.
1. Click <Start> menu, select <Settings>, then enter <Control Panel>.
2. After entering <Control Panel>, select <System>.
3. Select <Device Manager>
4. Find the <Connect port> and check the Virtual COM Port, which was created by the
USB driver,
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Please note that the Virtual COM Port number might be different from every computer.
Before using navigating software, please confirm the COM Port number created by your
computer and provided by your navigation software. Otherwise, the navigating software
won’t receive the satellite signal, because of the un-match COM Port setting.
5. SOFTWARE DATA
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NMEA 0183 V2.2 Protocol
Use RS-232 interface：4800 bps, 8 bit data, 1 stop bit and no parity.
5.1. NMEA Output Message
Table 5-1 NMEA-0183 Output Messages
NMEA Record
Description
GPGGA
GPGLL
GPGSA
GPGSV
GPRMC
GPVTG
Global positioning system fixed data
Geographic position: latitude/longitude
GNSS DOP and active satellites
GNSS satellites in view
Recommended minimum specific GNSS data
Course over ground and ground speed
5.2. Global Positioning System Fix Data (GGA)
Table 5-2 contains the values for the following example
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18
Table 5-2 GGA Data Format
Name
Message ID
Example
Units
Description
$GPGGA
161229.487
3723.2475
N
GGA protocol header
hhmmss.sss
UTC Time
Latitude
ddmm.mmmm
N/S Indicator
Longitude
N=north or S=south
dddmm.mmmm
E=east or W=west
12158.3416
W
E/W Indicator
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Position Fix Indicator
Satellites Used
HDOP
1
See Table 5-3
07
1.0
9.0
Range 0 to 12
Horizontal Dilution of Precision
MSL Altitude
Meters
Table 5-2 GGA Data Format-continue
Name
Example
Units
Description
Units
M
Meters
Meters
Meters
Geoid Separation
Units
M
Age of Diff. Corr.
Diff. Ref. Station ID
Checksum
second Null fields when DGPS is not used
0000
*18
<CR> <LF>
End of message termination
Table 5-3 Position Fix Indicator
Value
Description
0
1
2
3
0 Fix not available or invalid
GPS SPS Mode, fix valid
Differential GPS, SPS Mode, fix valid
GPS PPS Mode, fix valid
5.3. Geographic Position with Latitude/Longitude(GLL)
Table 5-3 contains the values for the following example.
$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C
Table 5-4 GLL Data Format
Name
Message ID
Latitude
Example
$GPGLL
3723.2475
N
Units
Description
GLL protocol header
ddmm.mmmm
N/S Indicator
Longitude
N/S Indicator N N=north or S=south
dddmm.mmmm
12158.3416
W
E/W Indicator
UTC Position
Status
E=east or W=west
161229.487
A
hhmmss.sss
A=data valid or V=data not valid
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Checksum
*2C
<CR> <LF>
End of message termination
5.4. GNSS DOP and Active Satellites (GSA)
Table 5-4 contains the values for the following example.
$GPGSA,A,3,07,02,26,27,09,04,15, , , , , ,1.8,1.0,1.5*33
Table 5-5 GSA Data Format
Name
Message ID
Mode 1
Example Units
Description
GSA protocol header
See Table 5-6
$GPGSA
A
3
Mode 2
See Table 5-7
Satellite Used(1)
Satellite Used(1)
Satellite Used
PDOP
07
02
Sv on Channel 1
Sv on Channel 2
Sv on Channel 12
1.8
1.0
1.5
*33
Position Dilution of Precision
Horizontal Dilution of Precision
Vertical Dilution of Precision
HDOP
VDOP
Checksum
<CR> <LF>
End of message termination
NOTE: Satellite used in solution.
Table 5-6 Mode 1
Value
Description
M
A
Manual—forced to operate in 2D or 3D mode
2DAutomatic—allowed to automatically switch 2D/3D
Table 5-7 Mode 2
Value
Description
1
2
3
Fix Not Available
2D
3D
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5.5. GNSS Satellites in View (GSV)
Table 5-8 contains the values for the following example
$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71
$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41
Table 5-8 GSV Data Format
Name
Message ID
Number of
Example
$GPGSV
2
Units
Description
GSV protocol header
Range 1 to 3
Messages
Message Number
Satellites in View
Satellite ID
1
07
07
79
048
42
Range 1 to 3
Range 1 to 12
Channel 1 (Range 1 to 32)
Elevation
degrees Channel 1 (Maximum 90)
degrees Channel 1 (True, Range 0 to 359)
dBHz Range 0 to 99, null when not
tracking
Azimuth
SNR (C/No)
Satellite ID
Elevation
Azimuth
27
27
Channel 4 (Range 1 to 32)
degrees Channel 4 (Maximum 90)
degrees Channel 4 (True, Range 0 to 359)
dBHz Range 0 to 99, null when not
tracking
138
42
SNR (C/No)
Checksum
*71
<CR> <LF>
End of message termination
NOTE: Items <4>,<5>,<6> and <7> repeat for each satellite in view to a maximum of four (4) satellites per sentence. Additional satellites
in view information must be sent in subsequent sentences. These fields will be null if unused.
5.6. Recommended Minimum Specific GNSS Data (RMC)
Table 5-9 contains the values for the following example.
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10
Table 5-9 RMC Data Format
Name
Example
Units
Description
Message ID
$GPRMC
RMC protocol header
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UTC Time
Status
161229.487
hhmmss.sss
A
3723.2475
N
A=data valid or V=data not valid
ddmm.mmmm
Latitude
N/S Indicator
Longitude
E/W Indicator
Speed Over
Ground
N=north or S=south
dddmm.mmmm
12158.3416
W
E=east or W=west
0.13
knots
Course Over
Ground
309.62
120598
degrees True
Date
ddmmyy
degrees E=east or W=west
Magnetic
Variation(1)
Checksum
<CR> <LF>
*10
End of message termination
NOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS84 directions.
5.7. Course Over Ground and Ground Speed (VTG)
Table 5-10 contains the values for the following example.
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
Table 5-10 VTG Data Format
Name
Message ID
Course
Example
$GPVTG
309.62
T
Units
Description
VTG protocol header
degrees Measured heading
True
Reference
Course
degrees Measured heading
Magnetic(1)
Reference
Speed
M
0.13
N
knots Measured horizontal speed
Knots
Units
Speed
0.2
K
km/hr Measured horizontal speed
Kilometers per hour
Units
Checksum
<CR> <LF>
*6E
End of message termination
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NOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS84 directions.
5.8. RTCM Received Data
The default communication parameters for DGPS Input are 4800 baud, 8 data bits, stop bit,
and no parity. Position accuracy of less than 5 meters can be achieved with the
GGM308U by using Differential GPS (DGPS) real-time pseudo-range correction data in
RTCM SC-104 format, with message types 1, 2 or 9. As using DGPS receiver with
different communication parameters, GGM308U may decode the data correctly to generate
accurate messages and save them in battery-back SRAM for later computing.
6. Warranty
A) Device: Altina warrants to the original end user (“Customer”) that new Altina branded
products will be free from defects in workmanship and materials, under normal use, for one
year if you are a purchaser in North America, Central America, and South America; 2 years
if you are a purchaser in a EU member state that has enacted into national law the EU
Directive on Consumer Guarantees (99/44/EC) from the original purchase date. At the time
of service, the owner will need to be able to provide evidence of date and place of purchase
and serial number.
B) Exclusions: This warranty excludes (1) physical damage to the surface of the product; (2)
damage caused by misuse, neglect, improper installation or testing, unauthorized attempts
to open, repair, or modify the product, or any other cause beyond the range of the intended
use; (3) damage caused by accident, fire, power changes, other hazards, or acts of God; or
(4) use of the product with any non-Altina device or service if such device or service caused
the problem.
Any third party products, including software, included with Altina products are not covered
by this Altina warranty and Altina makes no representations or warranties on behalf of such
third parties. Any warranty on such products is from the supplier or licensor of the product.
C) Exclusive remedies: Should a covered defect occur during the warranty period and you
notify Altina, your sole and exclusive remedy shall be, at Altina’s sole option and expense,
to repair or replace the product. If Altina cannot reasonably repair nor replace then Altina
may, in its sole discretion, refund the purchase price paid for the product. Replacement
products or parts may be new or reconditioned or comparable versions of the defective
item.
D) Obtaining warranty service: Dated proof of original purchase will be required. Products
or parts shipped by Customer to Altina must be sent postage-paid and packaged
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appropriately for safe shipment. Altina is not responsible for Customer products received
without a warranty service authorization and may be rejected. Repaired or replacement
products become the property of Altina.
WARRANTIES EXCLUSIVE: THE FOREGOING WARRANTIES AND REMEDIES ARE
EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OF IMPLIED,
INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE, CORRESPONDENCE WITH DESCRIPTION, AND NON-INFRINGEMENT,
ALL OF WHICH EXPRESSLY DISCLAIMED.
LIMITATION OF LIABILITY: NEITHER ALTINA NOR ITS SUPPLIERS SHALL BE LIABLE
FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES
OF ANY KIND, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS
ARISING OUT OF OR IN CONNECTION WITH THE SALE OR USE OF THIS PRODUCTS,
WHETHER BASED IN CONTRACT, TORT (INCLUDING NEGLIGENCE) OR ANY OTHER
THEORY, EVEN IF ALTINA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES. ALTINA’S ENTIRE LIABILITY SHALL BE LIMITED TO REPLACEMENT,
REPAIR, OR REFUND OF THE PURCHASE PRICE PAID, AT ALTINA’S OPTION.
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