Has anyone compared the Navionics UK & Holland app with the Imray charts app?

I don 't know which to purchase for the Ipad. The Imray app appears to be much bigger, taking a long time to download (they advise via computer then synch to the Ipad). One is vector, the other rastar, so what difference would that make for UK coastal passages?

Jim

Thank you for your response. I will be trying out the Navionics app at sea next week, having played around with it a bit (in the Cotswolds!)

Carolyn