I was given this item which is strictly a receiver and has no display. It is designed to be connected to a PDA or a computer in order to make use of it. It can be connected to a compact flash connector or with a serial RS232 connection. I used the RS232. mini 1394
    The cable is quite simple except that the GPS uses a mini-1394 connector which are not too common or easy to find. I found them quite cheaply in my travels in China and I built the cable with a DB9 connector for the computer. It is probable that the TXD wire to pin 3 of the DB9 connector is not necessary because, as far as I know, the GPS receiver transmits information but does not receive anything. Still, it is easy to connect anyway.
    The GPS receiver requires 3.3 V power supply and I get it from a USB connector by dropping down the USB 5 V with a couple of diodes. It uses up a USB port of which I have plenty but I might make a short USB extension cable from which I could get the power supply for the GPS and still plug the mouse into the same USB port. Serial Cable
    First I did some basic testing by connecting the GPS receiver to the serial port. I used Hyper Terminal, configured at 4800 baud, and confirmed the computer receives NMEA-0183 sentences. The GPS sends and the computer receives $GPRMC, $GPGGA, $GPGSA, GPGSV and other sentences which contain information about position, speed, etc.
    I then installed Haicom's Viewer software and it does display position, speed, direction and other information but it is only a basic program which has no map or graphic capability.
    Google Earth also has a limited capability. It will receive the GPS data and center the map on that point but it does not allow changing the scale (height of view) or displaying any other data like speed, etc. I have not really used it in any mobile application yet.

Serial Configuration (data link layer)
Baud Rate: 4800
Data Bits: 8
Parity: None
Stop Bits: 1 (or more)
Handshake: None

Application Layer Protocol Rules
Each message starting character is a dollar sign.
The next first five characters identify the type of message (talker).
All data fields that follow are comma-delimited.
The first character that immediately follows the last data field character is an asterisk.
The asterisk is immediately followed by a two-digit checksum representing a hex number. The checksum is the Exclusive OR of all characters between the '$' and '*'. According to the official specification, the checksum is optional for most data sentences, but is compulsory for RMA, RMB, and RMC (among others).
<CR><LF> ends the message




RMC Recommended Minimum sentence C
093721.239 Fix taken at 09:37:21 UTC
A Status A=active or V=Void.
3026.2880,N Latitude 30 26.2880' N
09341.7718,W Longitude 093 41.7718' W
022.4 Speed over the ground in knots
084.4 Track angle in degrees True
190108 Date - 19 Jan 2008
003.1,W (Empty fields) Magnetic Variation, W
*6A The checksum data, always begins with *

$GPGGA,093722.238,4026.2426,N,00341.7677,W,1,05,24.7,715.4,M,51.7,M,,0000*7 F

GGA Global Positioning System Fix Data
093722.238 Fix taken at 09:37:22.238 UTC
3026.2426,N Latitude 30 26.2426' N
09341.7677,W Longitude 93 41.7677' W
1 Fix quality: 0 = invalid
1 = GPS fix (SPS)
2 = DGPS fix
3 = PPS fix
4 = Real Time Kinematic
5 = Float RTK
6 = estimated (dead reckoning) (2.3 feature)
7 = Manual input mode
8 = Simulation mode
05 Number of satellites being tracked
24.7 Horizontal dilution of position
715.4,M Altitude, Meters, above mean sea level
51.7,M Height of geoid (mean sea level) above WGS84 ellipsoid
(empty field) time in seconds since last DGPS update
(empty field) DGPS station ID number
*47 the checksum data, always begins with *


Muti-Mode Foldable
GPS receiver

Introductions :

HI-303III is a GPS receiver with Compact Flash type1 / mini-1394 interfaces and built-in active antenna for high sensitivity to tracking signal. Based on the SiRF Star IV chip set and supports all functions (Single Sat updates in reduced visibility, Superior urban canyon performance, Foliage Lock for weak signal tracking, etc.).

HI-303III is well suited to system integration and users who use any kinds of mobile devices, such as, PDA, notebook PC, Tablet PC, etc. It satisfies a wide variety of applications for car navigation, personal navigation or touring devices, tracking and marine navigation purpose. Users can simply plug it into a PDA or other type of handheld PC running with suitable mapping and routing software for navigation.

Package :

Before you start up, make sure that your package includes the following items. If any items are missing or damaged, contact your dealer immediately.
  • HI-303III GPS Receiver unit
  • Male mini-1394 to PS/II cable
  • Carrying case
  • User Manual CD ( including User Manual, HaiTest Testing Program, Driver for PCMCIA card slot of Notebook PC )

Optional Accessories :

  • CF-PCMCIA Adapter PS/II to PDA connector and car charger ( * )
  • PS/II to DB9 adapting cable ( ** )
  • PS/II to USB adapting cable ( *** )

LED Indicator :

LED off Receiver switch off
LED on Position Fixed
LED flashing Signal searching

Specifications :

Interfaces Compact Flash type I & Mini-1394
Protocol NMEA0183 GGA, GSA, GSV, RMC, GLL
Baud Rate 4800, N, 8, 1
Max. Update Rate 1 Hz
Datum WGS84
Channel 20 channel
Frequency L1, 1575.42MHz
Hot Start 8 sec. Average
Warm Start 38 sec. Average
Cold Start 48 sec. Average
Reacquisition Time 100 ms
Position Accuracy 15m 2D RMS, SA off
Maximum Altitude 18,000m
Maximum Velocity 515m/s
Voltage DC 3.3V+- 10%
Power consumption 90mA continuous mode
Antenna Type Built-in active antenna
External Antenna Connector MMCX (Optional)
Dimension Fold : 68 (L) x 48 (W) x 24 (H)mm
Unfold : 120 (L) x 48 (W) x 21 (H)mm
LED Indicator 3D Positioning (blinking) or Searching GPS (on)
Operating Temperature -10° to + 70°
Storage Temperature - 40° to + 85°

Autor: Alfonso Gonzalez Vespa