Specifications
See
Datums
help for more information.
When calibrating a map and are using readings from your GPS make sure the readings were taken
with the GPS datum set to the same datum as the map.
Trouble Shooting
see also
OziExplorer Crashes my System
Common User Problems
Communication Problems
Read this section if you are having problems communicating with your GPS.
This can be divided into 2 sections, problems with the com port on the PC and configuration
problems with OziExplorer and/or the GPS.
COM Port Problems
Make sure you do not have any other programs also trying to use the COM port. These may include
FAX programs, programs which interface to Palm Pilots and other PDA's, terminal type programs
(e.g. Hyperterminal). If you have been using a DOS terminal program to read the output from the
GPS you must not only exit the terminal program but may also have to completely exit the DOS
window to release the COM port.
If you get the error from OziExplorer "
Failure to Open Com Port" this means the port is in use by
another program or does not exist, note that OziExplorer has not yet attempted to communicate with
the GPS, it does this only after it has successfully opened the COM port.
The serial output from most GPS receivers is in fact RS232C which means the output from the GPS
only swings between 0 anf 5 volts instead of the usual + and
-
10 volts (nominal). The majority of
PC's can handle the 0 to 5 volt input without any problems but I have heard of PC's which could not,
but
this is rare
and should only be checked as a last resort.
It is also possible to lock up the communication port on the GPS, so it is advisable to turn the GPS
off and on when attempting to establish communication to reset the port.
Configuration Problems
See the GPS Communication section of the Common User Problems
for information about this.
At low Baud rates (4800 or less) OziExplorer is more likely to not communicate with the GPS if
NMEA output is turned on, this applies to Lowrance & Eagle units only.
Screen Display Problems
If the map appears blocked and disjointed, usually after zooming the map then this is usually caused
by the graphics card drivers. See the section
OziExplorer Crashes my System
the same fix applies
for this.
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OziExplorer Help Contents