Just wanted to know with these electronic maps are you better off having a localized map or does a wider range map still have all the detail of ALL areas?

I just checked out what map I have and it is a bit old so, it also covers a huge area from Port Macdonell to Prin Charlotte bay.

If I was to upgrade which way to go?

I have travelled up north years ago for fishing trips in own boat but I don't think I would go that far anymore as fuel for trips would mean I could afford to go on Nomad.

Thanks
Tim