96 Hilux Surf with the PRADO engine

I recently bought a 1996 Surf with the 1KZ-TE 3L intercooled turbo diesel engine. Quite a beast it is!! and I'm enjoying every minute of it. But It came without an owner manual and it has a navigation system that I can't even understand. it's located just beneath the rear view mirror. I bought it froma Japanese domestic dealer so all the writing is in Japanese....I need help. I live in Jamaica.