RYA Yachtmaster Ocean course 


This course is for those aspiring to blue water cruising and is ideal for holders of the Yachtmaster Offshore certificate who are preparing for their first ocean passage.  It is the highest level of training provided within our RYA program, and highly respected for commercial positions on board of yachts.







Course content

  • The earth and the celestial sphere
  • Practical guide to use and care of sextant at sea
  • Meridian altitudes
  • Sun, star and other sights
  • Ocean passage planning

The course is taught over 40 hours with one exam paper. It can be covered as a series of weekend sessions, or as an intensive week-long course.


Ability after the course

The training on astronavigation will make your sextant your best friend, and allow you to confidently take sights at sea to obtain your position and carry out compass checks. In addition you'll have a better insight in worldwide meteorology, passage planning and communications for long voyages at sea. Combined with sessions on crew management, watch keeping, victualling, water and fuel management and emergency equipment, this will give you a great knowledge base for putting the theory into practice on an ocean voyage.


What's included

  • All course materials
  • Sandwich lunch and coffee/tea
  • Free parking at our premises
  • RYA Ocean certificate when successfully passing the exam


Supporting courses

We recommend the C-MASTERS practical celestial navigation course for exercising taking sights and position fixing with a sextant at sea.


Supporting books

Books to further enrich your knowledge on ocean passages are RYA Offshore sailing, the RYA Meteorology handbook and the RYA Sea Survival handbook



Details of this course

Duration :  5 consecutive days or 2 weekends



  • Kortgene, the Netherlands
  • Brussels area, Belgium


Previous experience: Coastal or offshore sailing


Assumed knowledge: Knowledge of navigation at level of RYA Yachtmaster Shorebased


Number of students: 6


Minimum age:  18 years


Cost: 1075 Euro






Register for this course


Course dates at our training centre in Zeeland :

  • Course divided over 2 weekend sessions on 5-6 April and 11-13 April - ONE LAST PLACE AVAILABLE






I loved it and it fully exceeded my expectations


 Having an instructor that loves the topic is half way the success. My expectations for this course were high. The instructor was able to exceed them. I'm happy with the outcome and this course made me even more enthousiastic about celestial navigation


-- Pedro --




Overview of all our shorebased courses



RYA Yachtmaster / Coastal Skipper theory

zee-5 4

Advanced shorebased course for skippers of sailing and motor vessels, preparing them for long (day and night) coastal and offshore passages, with lots of emphasis on passage planning, safety and navigation skills.

RYA Day Skipper theory classroom course


Intermediate theory course for crew members and beginning skippers, which lays the foundation for safe navigation and seamanship. Recommended for all sailors on tidal and non-tidal waters.

RYA Yachtmaster Ocean theory course

ym-ocean 2

Worldwide weather systems, celestial navigation and preparation of ocean passages, for those eager to cross the ocean and for professional skippers.


RYA Diesel Engine course


Learn the functionality of a diesel engine and how to maintain and repair it.

RYA Radar Operator course


Shorebased course on the use of radar systems, teaching you how to properly set up the radar system, use it for navigation purposes and to avoid collisions.


RYA First Aid course


This one-day course is designed to provide a working knowledge of first aid for skippers and crew of yachts and power boats.

RYA Short Range Certificate VHF course


One day course including exam for obtaining your VHF GMDSS marine radio certificate



RYA Sea Survival course


The RYA Sea Survival training course prepares you for worst case scenarios. Understand what to do in an emergency at sea including abandoning your yacht into a liferaft.


RYA Essential Navigation theory course


Introduction to navigation and safety awareness for new or inexperienced skippers and crew, and those wanting to refresh their skills.








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 C-MASTERS Training Centre Zeeland

               Veerhaven 3

               4485 PL   Kats

               The Netherlands



 C-MASTERS Training Centre Zeeland

               Veerdam 3

               4484 NV   Kortgene

               The Netherlands



 C-MASTERS Training Centre Belgian Coast


               6820   Nieuwpoort




 C-MASTERS Training Centre Brussels Region


               3090   Overijse





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