Highway Manager - A gas mileage program for the Palm platform
"Software in your pocket" tm


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In order to be able to use your GPS unit with Navio, you must configure Navio with the correct parameters so that it can find your GPS. Make sure that your GPS unit is set to output data in the standard text-based NMEA 0183 format. Navio requires the following NMEA sentences in order to be fully functional: GGA, RMC, GSV and GSA. For some receivers, these have to be turned on manually in the GPS's configuration screen. For more information consult the documentation that came with your GPS unit and check the compatibility page.

From this window you can also select your preferred units for distance, speed and position. These can also be changed from the main screen.

If you enter an altitude offset, Navio will substract this value from any altitude value that it displays.

Connecting your GPS

- Type: select Bluetooth GPS is you have a Bluetooth GPS. In this case Navio will automatically select the COM port that is assigned for Bluetooth serial communication in the Bluetooth control panel. If you have a serial GPS unit or just want to be able to select the COM port manually, select the "Serial NMEA 0183 option.

- When not in Bluetooth GPS mode, select the communication port that your GPS receiver communicates on, speed will usually be 4800 for most receivers and 57600 for the Navman GPS series. Parity is usually set to None, Data to 8 and stop bits to 1.

- Select Simulation Mode to read GPS data from a file instead of from a real GPS receiver. Using this function you can replay data that was previously saved either from the trip window or from the log function. When this option is checked, you will be prompted for the file to use when you press Start.

Some GPS do not send any RMC sentences, in this case select the option Use GGA sentence instead of RMC. Use this option only if you have trouble getting a fix in Navio.

*  For Navman, make sure you have installed the latest service pack and the serial driver v3.1.6.

*  For help getting Navio connected to your GPS receiver (for example with TomTom3), see our online support page. For TomTom Bluetooth GPS use Navio v2.3 or higher.

GPS Accuracy

Click on the menu icon () in the tool bar and select GPS Accuracy to open the Navio GPS accuracy configuration.

- Enter the precision of your GPS unit. For modern GPS this can be as good as 10 meters although older units might be a lot less accurate. Check the documentation that came with your GPS unit.

- Enter the minimum accuracy that you want to have.

You can then choose to enforce GPS accuracy or not.

  • GPS Accuracy is OFF: when Navio is told by your GPS unit that the quality of the fix is not very good and that the accuracy is below the minimum that you have entered, the usual green fix light at the top corner of Navio will change to yellow to warn you of this condition. You can then choose to ignore the current GPS data or not.
  • GPS Accuracy is ON: when the accuracy is below the preset minimum, Navio will treat the data as if it didnt have a fix and will thus change the fix light to red. This will also stop the recording of trip data from the Trip window and will prevent you from searching A2B based on your current position.

- Some GPS units do a lot of averaging internally (e.g.: TomTom GPS) and provide course heading values only when the GPS is moving at enough speed. This gives a very stable compass reading from the Navio main screen. However other GPS units are not as good and can give very wild course readings at slow speeds. This makes it hard to use the compass feature of Navio when walking and geocaching. In such cases, enter a minimum speed for which Navio will display course heading values. If you are having problems with the course values, try entering a value of 1.8 ~ 2 km/h (~1 knot).

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