Navit has been successfully ported to TomTom devices. However, the TomTom port is still experimental and some features do not work properly yet. This page lists the things that have been done so far and contains some detailed instructions on cross-compiling Navit and some required libraries for TomTom Linux. It also contains some setup instructions for using pre-compiled binaries available at http://www.navit-project.org/~xenos1984/navitom.tar.gz.
Lots of information on the hardware of various TomTom models has been collected at http://www.opentom.org. These devices feature an ARM920T or ARM926EJ-S CPU.
TomTom GPS settings
Devices with SiRFstarIII receiver like Tomtom go 730 work with this setting:
<vehicle name="Local GPS" profilename="car" enabled="yes" active="1" lag="14" source="file:/dev/gpsdata" follow="1" >
Devices with Global Hammerhead v1 like Tomtom one XL work with this setting:
<vehicle name="Local GPS" profilename="car" enabled="yes" active="1" lag="14" source="file://var/run/gpspipe" follow="1" >
In a standalone setup without Tomtom environment Global Hammerhead v1 need a closed source driver named "gltt". It can be extracted from a original ttsystem file. gltt write to the named pipe /var/run/gpspipe
gltt is called like this sample: gltt -baud 115200 -periodic 1000 -fix_start normal -rftype HH_4L
You can get some informations about used device names in /proc/barcelona or the built in flash drive.
RAM memory issues
Most Tomtom devices like TomTom one XL have only 32MB RAM. Navigation in cities is almost unusable. Devices with 64MB like Tomtom 730 work with reduced routing depth like route_depth="4:15%,6:1%,8:10000,18:2000"
It is possible to build a full custom setup with the toolchain from http://opentom.sf.net With it its possible to activate swap to SD card. The toolchain is a bit outdated and need some manual changes to compile.
Using pre-compiled binaries
There are some pre-compiled binaries available at http://www.navit-project.org/~xenos1984/navitom.tar.gz (this link always points to the most recently compiled version). See http://www.navit-project.org/~xenos1984/release/ for other / older versions. I have tested them successfully on a TomTom GO 910. For other TomTom models, it may be necessary to edit the navit.xml config file and adjust the screen size, the GPS data source...
In order to use the binaries above, unpack the file in the top directory of a TomTom device. Get some Navit map and place it in the navit/share/maps folder on your TomTom. Edit the config file navit/share/navit.xml as described below. Unplug your TomTom from the computer and let it reboot. If you touch the screen and enter the TomTom main menu, you should see a Navit icon (on the last page). Press this icon and a grey screen will appear. Be patient - it may take a few seconds. But finally you should see a map. Have fun!
A more recent version (R7045) can be found here https://1390-30791823-gh.circle-artifacts.com/2/tmp/circle-artifacts.xgv65b2/navitom.zip It does not provide a config for 320x240 screens but it has translations and multilingual speech.