TomTom Plugin csv

Hello,
Do you know if there are any TT plugins that works with Navcore 8x or 9x ?
Do you know ow to write my own plugin?
I woul like to keep track of my work trip and my personal one and save into the TT memory a CSV file with the km and the destination.
This will help to understand how many km I made every months for work purpose and personal ones.

I haven't find something that could help me to do store this kind of information, so I would like to write my own plugin...
Do you have any suggest?

Any help is appreciated.
Thanks in advance,

I'm not aware of any plugin's available for a TT but it would be interesting if you could write your own