Troubleshoot the GPS input

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After a few minutes if Nuno Navigator is still searching for your GPS follow the steps detailed below:

  • Check you have switched your GPS on.
  • Check that your GPS is configured to output NMEA 0183.
  • Check that your GPS is configured with the following
    • 8 data bits
    • No parity
    • One of these baud rates:
4800
9600
14,400
19,200
38,400
56,000
57,600
115,200
128,000
256,000
  • Check that the wiring between your GPS and your computer is secure.
  • Check that any additional interface box (such as an optical isolator or data concentrator) is switched on and has power connected (if its power is not derived from a computer USB connection).
  • Install any software drivers that came with your GPS.
  • Check that no other running applications are using the port that the GPS is connected to.
  • Check that your GPS is configured to output positions using the WGS84 horizontal datum. This may be referred to as "Hor Datum" or "Map datum" in the GPS configuration.

More control over the COM ports used

We think that the automatic detection of COM ports and port settings is preferable over manually configuration. But in more complex setups and where other software is also in use that needs COM port access the facility exists to black list or white list COM ports.

Blacklist COM ports

COM ports can be be "black listed" - removed from consideration when Nuno is scanning for GPS and AIS receivers. This is by modifying a registry value.

COM port settings are in:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\CherSoft\Nuno Navigator\Communications

The value "Black List" can contain a comma separated list of COM ports that you do not wish to have considered. e.g. COM1,COM2,COM3

Whitelist COM ports

Putting a "white list" of COM ports overrides the scanning of the computer for available COM ports. It allows you to fully specify the baud rate and other parameters.

COM port settings are in:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\CherSoft\Nuno Navigator\Communications

The value "White List" can contain a list of COM ports to use, for example:

For a 9600 8-N-1 setting on COM1 use the string

2,COM1,9600,8,0

2, - All white lists should start with 2 COM1, - is the COM port number 9600, - is the baud rate 8, - is the number of bits 0 - is the parity (defaulted values there are 1=one stop bit and 2=timeout multiplier)

The one stop bit is the default which is omitted in the above example. 9600 8-N-1 is actually the default so the above can be simplified to COM1.

If you wish to white list more than one COM port you must include all the defaulted values:

2,COM1,9600,8,0,1,2,2,COM2,4800,1,2

Please get in touch with support@nunonavigator.com for help with this fiddly stuff.

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