Overview of the GPS data flow
Installation steps
How does GPS work in my PDA?
Installing to work side by side with another GPS application
1.) Download and install the Jitti client from the download page.
During installation, you may receive warnings, that this program is from an
unknown publisher. Answer "Yes" to these warnings.
Install Jitti on the Device, not on a storage card (to let it run
continuously in the background).
2.) On your PDA, go to Start / Settings / System / GPS
3.) On the Access tab, check the "Manage GPS automatically" checkbox
4.) On the Hardware tab, select the COM port and speed, where the GPS receiver emits the GPS data stream. See the documentation of your device for details, or play around, until you get it right. (In most cases, this would be COM2, at a speed of 4800 baud. The correct values for some evices can be found here.)
5.) Close GPS configuration by clicking OK in the upper right corner.
6.) Test your settings in a place where GPS reception is not obstructed, such as in an open space with a clear view of the sky.
7.) Start your Jitti client. In a few minutes the application should be receiving GPS data, and the antenna icon on the main screen should turn green.
The GPS receiver emits position and speed data as a text stream, on a specified serial port. However, only one client can consume this stream, it is not possible to send the data to two different consumers. To resolve this problem, Windows Mobile 5.0 introduced the GPS Intermediate Driver, which becomes the only direct consumer of GPS data, and re-emits it on a second, predefined serial port. In the meantime, nice new applications such as Jitti can get position data from the Intermediate Driver.
So, with Windows Mobile 5.0 you can use any number of well-behaved clients, plus one legacy application.
There is one thing to keep in mind, however: the GPS Intermediate Driver counts its consumers, and switches the GPS hardware off, when there are no active clients. So, in the scenario below, the Jitti client has to run, to enable the flow of data through the GPS Intermediate Driver.
Overview of the GPS data flow
Here we assume that you have a legacy GPS navigation application that need the original GPS data stream, plus Jitti.
1.) Download and install the
Jitti client from the download page.
During installation, you may receive warnings, that this program is from an
unknown publisher. Answer "Yes" to these warnings.
Install Jitti on the Device, not on a storage card (to let it run
continuously in the background).
2.) On your PDA, go to Start / Settings / System / GPS
3.) On the Access tab, check the "Manage GPS automatically" checkbox
4.) On the Hardware tab, select the COM port and speed, where the GPS receiver emits the GPS data stream. See the documentation of your device for details, or play around, until you get it right. (In most cases, this would be COM2, at a speed of 4800 baud.)
5.) On the Programs tab, select any port but the one you specified in step 4.
6.) Close GPS configuration by clicking OK in the upper right corner.
7.) In your legacy GPS application, specify the port from step 5, as the source of GPS data.
8.) Test your settings in a place, where GPS reception is surely not obstructed, such as in an open space with a clear view of the sky.
9.) Start your Jitti client. This will switch on the GPS Intermediate Driver, and enable the data flow to the legacy GPS application.
- Your Jitti client should be receiving GPS data.
- Your GPS navigation application should be receiving GPS data as well.