Contours are visible when using the 3D features.
A further update which makes this an even more essential app for when you #GetOutside
I've also added a new affiliate button to the blog, as you will see in the right hand sidebar of the blog, and this has also been added to this post only.
Are you thinking of buying a new OS map, or subscribing to OS maps? If so, please just click that link there and I'll be paid a small referral fee. It won't cost you any more... If you want to buy plenty of maps for the start of the new school year, then feel free :)