• The earth and the celestial sphere.
        • Definition of observer’s zenith and position of a heavenly body in terms of latitude, longitude, GHA and declination
        • Right angle relationships, latitude and co-lat, declination and polar distance
        • Relationship between GHA, longitude and LHA
        • Tabulation of declination in nautical almanac
        • Rate of increase of hour angle with time
      • The PZX triangle
        • The tabulated components of the triangle, LHA, co-lat and polar distance
        • The calculable components, zenith distance and azimuth
        • Relationship between zenith distance and altitude
        • Introduction to the tabular method of solution in the Air Navigation Tables and the basic sight form
        • The use of calculators for the solution of the PZX triangle
      •  The sextant
        • Practical guide to the use and care of a sextant at sea
        • Conversion of sextant altitude to true altitude
        • Application of dip, index error and refraction
      • Correction of side error, perpendicularity, index error and collimation error
        • Measurement of time 
        • Definition of, and relationship between, UT, LMT, standard time and zone time
        • Rating of chronometers and watches
        • Meridian altitudes
        • Forecasting time of meridian altitude
        • Reduction of meridian altitude sights
        • Sun, star and other sights
        • Reduction and plotting of sun sights using Air Navigation Tables
        • Awareness of use of calculator for sight reduction
        • The plotting of sun-run-sun meridian altitude
      • Awareness of the reduction and plotting of sights obtained from stars, moon and planets
      • Compass checking
        • Use of amplitude and azimuth tables systems and/or calculator
      • Satellite Navigation Systems
        • Principles and limitations of use of all systems
      • Great circle sailing
        • Comparison of rhumb lines and great circles
        • Vertices and composite tracks
      • The computation of a series of rhumb lines approximating to a great circle by use of gnomonic and Mercator projections
      • Meteorology
        • General pressure distribution and prevailing winds over the oceans of the world
        • Tropical revolving storms, seasonal occurrence and forecasting by observation
      • Passage planning
        • Publications available to assist with planning of long passages (routeing charts, ocean passages of the world and other publications)
        • Preparation for ocean passage including survival equipment, victualing, water and fuel management, chafe protection, spares and maintenance
      • Passage making
        • Navigational routine
        • Watch keeping
        • Crew management 
      • Communications
        • Satellite and terrestrial systems
        • Weather information

Pre-course preperation
Finish RYA Coastal Yachtmaster / Yachtmaster Offshore Theory
Minimum time
50 hours
The course includes Revision to day Skipper level and the coastal Yachtmaster offshore online course including charts, almanac, course notes, connection to the RYA plotter simulator, plotter and dividers and the online assessment.
Free plotter and dividers so all you need is a pencil and a table.
Free mini radar simulator and boat handling animations unique to Navathome courses
RYA Ocean Yachtmaster Theory

If you're interested in this course, please fill out the inquiry form below. (How to Register)