I have Garmin BlueChart on my Iphone and Ipad. If I remember correctly it was about $45 and the updates are $30 a year if you want to update. I've used it to plan my upcoming trip. It's a great program that I use with my Garmin Chartplotter back home to upload waypoints and routes. I don't think moorings uses Garmin electronics, but it will be a plus if they do.