YES Nav Box is great value for money.
It will also print out a plog and you can put in your fuel and speed to get all the figures you want. It is the best £20- or so you will spend! Very intuitive to use and large coverage,Iceland in the N.W to Crete in the S.E!! Loads of phone numbers for all the strips, quite a few of which are not on your CAA chart! Frequencies, ILS and nav aids all on there.