I've recently started using the CMAP "Embark" app on mobile and computer and it's so handy I had to post about it!
In short, Embark is a FREE mapping tool, which you can use to create waypoints, plan routes and use as a tracking tool when you're out on the water.
I've been playing around with it by creating routes from the OBC and Half Moon Bay to a few popular fishing spots, to give me an idea of how long it will take to get there, so I can plan my day accordingly.
A few screenshots of my different routes are below.
Route from OBC to Tiritiri Matangi Island
A number of routes from the OBC and Half Moon Bay, to various fishing spots.
When you zoom in, the maps are reasonably detailed and have all the appropriate safety markings on them. See a screenshot below of the Noises in the Hauraki Gulf, and the channel between Great Barrier and Little Barrier.
The Noises as shown on Embark in a browser.
Detail in the channel between Great Barrier and Little Barrier.
TL;DR:
If you were ever out on the water and needed a back up map, this would be my go to.
While competitor, Navionics, has a good following of app users, at $24.99 to download I think a lot of people will be giving the Embark app a try first!