Below are few links to articles and reviews of apps for the marine world
Cruising World: http://www.cruisingworld.com/gear/electronics/there-s-an-app-for-that
App of the Miami Boat Show: http://www.miamiboatshow.com/attendees/mobileapp.aspx
Blue Water Sailing: http://bwsailing.com/BWS_newsandnotes_Review-of-Navimatics-with-ActiveCaptain-for-iPhone–iPad.html
US Sailing Racing Rules App: http://www.tradeonlytoday.com/images/stories/web/breaking_news/ussailing0305.pdf
WaterWay Guide App: http://www.tradeonlytoday.com/images/stories/web/breaking_news/waterway0301.pdf
CNN’s Recommended Apps: https://www.murrayyachtsales.com/iphone-apps-for-sailors/