Marine chart app for i phone

[rannoch raider]

Hi Folks,
Considering getting a marine chart / GPS plotter app for the I phone. I know such things are out there and was wondering if anyone has / is using one or has any recommendations ?

Cheers
Jim

[lochgarryfisher]

Don't have an answer for you Jim but can i ask the forum the same question but for Android.  Have tried a few free "waypoint" apps but haven't found a decent one yet.