Seabook serves as a key information source for seafarers and shore-based employees to promote safer seas and cleaner waters. This easy-to-use, accessible-offline mobile app serves as a reference tool for key elements of Ship stability, Navigation, COLREG and Marine engineering, and is designed for seafarers, cadets, maritime students and master mariners alike.

Seabook contains details on;

1) COLREG (International Regulations for Preventing Collisions at Sea)
2) GMDSS (Global Maritime Distress and Safety System)
3) International Code of Signals
4) Marine Engineering
5) Navigation at Sea
6) Ship Stability
7) Country Flags
8) Ropework
9) Knots

What’s New

Version 2.0.1

Minor content updates

+ Ropework
+ Navigation
+ Ship Stability
+ Country Flags

and improved user experience for iOS12

Ratings and Reviews

4.5 out of 5
15 Ratings
15 Ratings
AkshayDoiphode05 ,

THANK YOU! Thanks a lot!

This app is really something! I am appearing for my 2nd mates competency exam and this app is one good thing to happen to me , apart from the books and syllabus,its good to have such app in your pocket for quick reference, thank you again for such an amazing app !!!!

Phenom_03 ,

One of the complete and useful apps for mariners

One of the best apps out there thanks to the developers who made this app. This is very useful to every mariner, it is like a handbook of basic need-to-knows about maritime.

Captain Denny ,

Some good but more mistakes

Many mistakes in the basics for Rules of the Road and other subjects. Example: On what planet does one prolonged and three short mean at anchor in fog? In means the last manned vessel towed astern.


13.1 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Ozgur Dogan GUNES


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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