Learning Google Drive and BMW Navigator 5

[2wheelsinmotion]

Hi Everyone,

I'm the new owner of a BMW Nav 5 and I'd like to plan some trips using a map program then transferring this to the Nav 5. I'm happy to try any program and for now have been experimenting with Google Drive.
Ideally I'd like to use Google maps (or suggest an easier map program) to work out a rough plan choosing dirt roads etc then transfer it to the Nav 5.
From my understanding I'll need to save my maps to a format that the Nav 5 can use.

I'd like to try and get my head around all this before xmas if possible.

Are there any step by step dummy guides / Utube videos available so I can work through it all.......atm it's a bit overwhelming

thanks David