My wife and I have a whole pile of ordnance survey maps [0] for hiking. Nothing will replace it. She was a Brownie [1] and we're doing similar stuff with our daughters (Geocaching is the big thing right now).

0. https://shop.ordnancesurvey.co.uk/maps/

1. https://www.girlguiding.org.uk/what-we-do/brownies/