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


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You can track your position and moving progress on any map (GIF, JPG, PNG and BMP) that you have scanned in (be careful to respect copyright notices). This feature is great for travelling, hiking, geocaching, golfing, sailing and much more.

The size of the map that can be loaded by Navio will depend on your Pocket PC but this tends to be around 2000x2000 pixels in GIF 256-color mode. Using a GIF file will save memory compared to a JPEG file.

Maps must be saved in the \My Documents directory in order to be recognized by the program or on the root directory of a memory card. When you exit the program, the reference points you have defined are conveniently saved and do not need to be re-specified the next time you use the same map.

Navio does not come with any maps but you can find some in the links below. Note that you should try to use maps that use a linear scaling of latitudes and longitudes (also called Equidistant Cylindrical):

Blank Maps

If you do not have any maps for your current location you can also tell Navio to use a blank map. Make sure you have a GPS fix and then select the option Use Blank Map from the menu (). Navio will automatically calibrate the blank map to your current location. Use the zoom out and in buttons to, respectively, increase or decrease the area covered by the blank map.

Reference Points

In order to be able to track your location on a map, you first need to define 2 or 3 reference points together with their GPS coordinate. These points will be identified by a blue cross. It is very important that you define these points as accurately as possible as they will determine how accurate Navio is at showing your position on the map. For two point calibration: choose two points which are a certain distance from each other in both the horizontal and vertical directions. For three point calibration select for example a point in the top-left, bottom-left and top-right corners or a similar pattern. Use 3 reference points for better accuracy.

To add a reference point, tap and hold (right-click on Windows) on the map where you want to add a reference point, and select Add Ref Point from the menu that appears.

You can edit, move and delete an existing reference point by tapping and holding on it (right-click in Windows) and selecting the desired action from the menu.

If you don't know the GPS coordinates of places on your map you can get some help from this geocoding website.

Map items

Once at least 2 reference points have been defined, a red arrow will indicate your current position and direction. You can choose to have the program center the map on your current location or not with the option Center Position in the menu ().

A purple cross represents a way point that has been defined in the POI window. Tap on a way point to see the description associated with it (tap again to release). The display of way points can be turned on/off with the option Show POI.

A blue line shows a route which is a series of way points linked together. Option Show POI Route.

A red line represents the track selected in the Trip window. Option Show Trip Route.

Click on the map to center the map on that position. You can also use the hardware direction keys to scroll the map in all directions.

There are 3 main modes:

Scroll mode: click on the map and drag the mouse/stylus to move the map around.

Measure mode: click on the map and drag the mouse/stylus to see the distance between two points. The distance will be displayed in the units selected on the Hardware window. Tip: scan the map of your favorite golf course and then easily see the distance between your current position and the next hole!

Non-linear measure mode: move the stylus/mouse on the map to see the distance of the path drawn.


Switches to full screen (Pocket PC only).

Zoom in up to 8x. In blank map mode, decreases the area covered by the blank map.

Zoom out up to 0.25x. In blank map mode, increases the area covered by the blank map.


Tap and hold the stylus on the map (right-click in Windows) to open the options menu for items that are position specific such as reference points and POIs. Options available in this menu:

  • Reference point: If you clicked on a reference point you will be able to edit, delete and move the reference point selected. If less than 3 reference points have already been defined, you will also be given the option to add a reference point.
  • POI: If you clicked on a POI you will be able to edit, move and delete it. The add POI option will always be enabled and allows you to add a POI at the position where you clicked on the map.
  • Show Coordinates: shows the latitude and longitude at the location selected.
  • Search A2B: searches A2B based on the location selected.

Click on the menu icon () for selecting various display options such as:

Add Waypoint - adds a waypoint at the position clicked by the mouse/stylus.

  • Center Ref Point: centers the map on the selected reference point.
  • Center Position: keeps the map always centered on the current position.
  • Show Position: shows the current latitude/longitude at the top of the screen.
  • Show Speed: displays the current speed.
  • Show Direction: displays the current heading.
  • Show Altitude: displays the current altitude.
  • Show POI: displays the way points that are within the bounds of the current map.
  • Show POI Direction: displays the direction to follow to get to the POI selected in the POI window. You can select a POI from the POI window by clicking on it in the map window.
  • Show POI Name: displays the abbreviation of each POI.
  • Show POI Route: displays the route for the way points currently loaded in the POI window. Shows up as a blue line on the map.
  • Show Trip Route: displays the track selected in the Trip window. Shows up as a red line on the map.
  • Use Blank Map: Opens a blank map and automatically calibrates it for your current location. This option will only be enabled when you have a GPS fix.
  • Load Map - loads a new map from the \My Documents directory or from a removable card.

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