Hi,
I think you should take a look at the trakker nav website. Here's the FAQ: Trakker NAV
Info about In-Dash Navigation: In-Dash Car Navigation | Trakker NAV and Car Navigation for Toyota Corolla - Altis & GLi | Trakker NAV
Basically, I think you need to buy another SD-Card from them.
"I Lost My SD / Micro SD Card Can I Get A Replacement?
Each SD Card has a unique license; in case of losing the SD Card you have to re purchase software.
For Toyota 3D Users:
Please visit Trakker NAV help desk at your nearest Toyota 3S dealership to get a replacement.
For 2D Users:
Please visit our branch office in nearest to you for a replacement."
You should possibly call them on their hotline. Hope this helps. According to them, the map is updated about every 6 months for PKR 2000 (free first year). I'm not sure how useful that is, considering how often something changes. Might as well use something like Mapfactor Navigate on your phone / tablet with a car holder, and get the openstreet maps.