How to Connect to a Base or Network in CHCNAV TX73

Watch the video or follow the step by step guide below:

1. Check whether the site has a local GPS base station.

  • When you arrive on a new project, first find out whether a GPS base station is already running on site. 

  • If a base station exists, you should connect to it so the excavator knows its position on the project. 

  • If there is no base station, you’ll need to use a CORS correction service instead. 

2. Open receiver settings to view or manage correction profiles.

A drone crop spraying control interface showing a 3D map of a field with multiple colored spray paths, measurement indicators, and control buttons.

  • On the machine display, go to Menu → Common → Receiver Settings. 

  • This screen shows technical receiver information, including visible satellites and current receiver status. 

  • On the right side, you’ll see a list of available receiver settings or profiles. 

  • On a new machine, this list may be blank. 

3. Add a new radio base station profile if the site has a base station.

Screenshot of a GPS receiver settings interface showing configurations like satellite tracking status, antenna type, timeout, elevation mask, heading angle, base station distance, and port numbers with navigation options including a 'More' dropdown menu.

  • If the project has a new base station that is not already saved in the machine, you need to create a new profile. 

  • Select More → Create Radio Base Station. 

  • Enter the base station details provided by the project or survey team. 

  • Confirm the settings once everything has been filled in. 

  • You should now be able to connect to the base station 

Screen showing a form to set up a new radio base station with fields for name, protocol, air baud rate, channel, frequency, and version, and options for FEC, cancel, and confirm.

4. Add a CORS profile if there is no site base station.

  •  If the site does not have a base station, use a CORS subscription service for GPS corrections (SmartFix, 24-7 RTK, PositionNZ etc) 

  • If the machine already has one of these profiles saved, you can simply select it. 

  • If not, go to More → Create CORS and enter the service details provided by your provider. 

5. Apply the selected profile and make sure it becomes active

Screenshot of receiver settings displaying CORS and API configurations for smartfix and ygy stations, including addresses, ports, user names, and options to edit, delete, or apply.

  • After confirming the profile, press Apply. 

  • Once active, a star should appear next to the selected profile. That star indicates the profile is now the active correction source. 

  • The connection should complete successfully. 

6. Verify the GPS connection on the main screen.

A drone control screen displaying a 3D construction plan with colorful lines and measurements, including dimensions of 5.00 units, and various control icons and tool options.

  • Return to the main screen to check whether everything is working correctly. 

  • Look for these indicators in the orange bar on the top of the screen:  

  • Satellite count: usually around 30–40 satellites in most parts of New Zealand. 

  • Main GPS antenna: should say Fixed. 

  • Secondary antenna: should also say Fixed. 

  • Residuals / accuracy values: should generally be around 20–30 mm. 

  • If the residuals are much higher than that, stop and investigate before continuing. 

7. Check cell coverage and ask for help if needed.

Screen display of a drone or aircraft control interface showing a 3D map with multicolored flight path lines, settings, and measurements, including altitude and distance indicators.

  • Make sure the machine has cell coverage, especially if you are using a correction service that depends on it. 

  • If there is no cell coverage, you may not receive good corrections. 

  • If anything looks wrong with the satellite count, fixed status, residuals, or connection status, call for support and ask for help.