I contributed to a thread on moble apps last week and noticed that Scardypants mentioned this one
I've now downloaded the free trial (full cost $10) and used it for a dog walk.
Its the first of these apps that I've seen that lets you track an activity on a 1:25000 scale OS map. More than that it lets you download the maps that you want at home on wi fi before you set off. Draw a recatngle around the area you are visting and it downloads the maps you need to your sd card
I though that if you wanted on line OS explorer you had to pay for them? So is that a caching loop hole that will be closed or amazing value?
There is a desk top version for planning on large screen for $35 as well