C-Nav Frequently Asked Questions (FAQ)
Contact C-Nav support by e-mail at cnav.support@cctechnol.com to submit any questions about our C-Nav products or services.
WE ARE HAVING A DEBATE ABOUT THE PREFERRED CORRECTION MODE FOR THE C-NAV GPS SYSTEM. IS IT RTG,WCT &
Date: 2004-05-20The 'global' RTG correction mode can yield the most accurate solution at the 25cm level 2dRMS when fully stabilized.
The regional...
HOW DO I SEND RECORDED DATA FILES TO C-NAV® SUPPORT FOR HELP AND ANALYSIS?
Date: 2002-09-04RAW GPS 'binary' data files (recorded using STARUTIL) or C-Nav NMEA ASCII data files (with ALL C-Nav NMEA messages enabled) can be...
I WAS WONDERING IF YOU COULD HELP EXPLAIN SOME SLIGHT ANOMALIES WE SEE WITH THE C-NAV® GPS SYSTEM?
Date: 2002-04-08I was wondering if you could help explain some slight anomalies we see with the C-NAV GPS System?
It appears that C-NAV does not...
WHY DO I HAVE INTERMITTENT GPS LOSS?
Date: 2001-12-13When GPS signal lock is intermittent on the C-Nav 'masthead unit', this is usually due to poor mounting location or RF interference...
IS SIGNAL AFFECTED BY POWER LINES OR STRONG MAGNETIC FIELDS?
Date: 2001-12-13In North America, the energy from electrical power lines is 60 Hz (50 Hz inEurope). The harmonic energy falls off rapidly as the...
HOW SHOULD I CHOOSE THE BEST LOCATION FOR MY RECEIVER?
Date: 2001-12-13The C-Nav GPS receiver must be mounted so that it has a clear view of the sky, on the centerline of the vessel or vehicle, away from...
HOW DO I CHECK MY CABLE?
Date: 2001-12-13To check the C-Nav GPS receiver cable for a short, use an ohmmeter. The resistance of a good cable between any of the conductor is...
WHY DOES GCGPS WORK IN SOME PLACES BUT NOT OTHERS?
Date: 2001-12-13
The radio signals from the geo-stationary communication satellites that broadcast the GcGPS corrections occasionally get blocked or...
HOW CAN I VERIFYING NMEA MESSAGES ARE BEING OUTPUT?
Date: 2001-12-13The NMEA messages are simple ASCII text messages. Therefore use of a PC with an RS232 communications port and use a Windows terminal...
HOW IS THE CHECKSUM CALCULATED IN NMEA 0183?
Date: 2001-12-13
How is the checksum calculated in NMEA 0183? The checksum is the 8-bit exclusive OR (no start or stop bits) of all characters in...
HOW DO I INTERFACE C-NAV® RTCM WITH OTHER GPS RECEIVERS?
Date: 2001-12-13Use the second (2nd) RS232 DB9-Female connector of the CnC Display Unit, which allows RTCM output to be sent to a 3rd party DGPS...
HOW DO I VERIFY RTCM MESSAGES ARE BEING OUTPUT?
Date: 2001-12-13Connect the 3rd party DGPS receiver to the CnC Display Unit RTCM RS232 connector and monitor the GGA NMEA message. If the GPS quality...
WILL I LOSE MY SETTINGS WHEN THE RECEIVER IS POWERED OFF?
Date: 2001-12-13
The C-Nav GPS Receiver configuration parameter settings are stored in batterybacked RAM (random access memory). The Lithium battery...
HOW DO I RESTORE THE RECEIVER TO FACTORY DEFAULTS?
Date: 2001-12-13
To restore the receiver configurations to factory defaults simply execute the Restore Defaults command:
Use the CnC Display...
THE CNC DISPLAY UNIT IS POWERED ON BUT NOTHING HAPPENS AND NO CHARACTERS ARE DISPLAYED ON THE LCD PA
Date: 2001-12-13The C-Nav Control Display Unit may be left in ‘PROGRAMMING MODE'. Turn off the power and using a flat bladed screw driver, carefully...
WHAT IS C & C TECHNOLOGIES C-NAV®?
Date: 2001-12-11
GLOBAL REAL TIME, DECIMETER ACCURACY GPS
GcGPS - GLOBALLY CORRECTED GPS
C-NAV system corrections are not based on traditional...
HOW TO DETERMINE THE GPS ENGINE TYPE IN MY C-NAV2050 RECEIVER?
The C-Nav2050 series of GPS receivers can be equipped with either NCT-2100D or NCT-2000D GPS engines. Typically, receivers with a tag serial number...
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