1.5.10 Horizontal sextant angle (HSA)
- 10.0 All the Grade 10 Nautical Science videos
- Introduction to the Grade 10 content
- 1 Navigation
- 1.1 Navigation
- 1.1.1 Introduction
- 1.1.2 The Navigator
- 1.1.3 Navigation equipment
- 1.1.4 Navigation instruments, publications and stationery
- 1.2 Navigation definitions and concepts
- 1.2.1 Navigation definitions
- 1.2.2 Navigational charts
- 1.2.3 Passage planning
- 1.3 Measurement of position and distance on the earth’s surface
- 1.3.1 Practical application
- 1.4 Measurement of direction
- 1.4.1 Three figure notation
- 1.4.2 Cardinal and intercardinal points
- 1.4.3 Relative bearings
- 1.4.4 Compasses
- 1.4.5 Variation, magnetic bearing and deviation
- 1.4.6 Compass bearings and the procedure for converting compass bearings
- 1.5 Chartwork – plotting and chart symbols
- 1.5.1 The position line
- 1.5.2 The fix
- 1.5.3 The observed position and dead reckoning position (DR)
- 1.5.4 Ships track and estimated position (EP)
- 1.5.5 Taking bearings and visual bearings of terrestrial objects
- 1.5.6 Cocked hat
- 1.5.7 Radio direction finding (DF) bearings
- 1.5.8 Fixing by position circles
- 1.5.9 Distance by vertical sextant angle
- 1.5.10 Horizontal sextant angle (HSA)
- 1.5.11 Transits
- 1.5.12 Position by Global Positioning System (GPS)
- 1.5.13 Leading lights and markers
- 1.5.14 Rising and dipping of a light and ranges of lights
- 1.5.15 Danger angles
- 1.5.16 Example of a position determined by horizontal sextant angle and vertical sextant angle.
- 1.6 Measurement of time at sea
- 1.6.1 Introduction
- 1.6.2 Zone time at sea
- 1.6.3 Standard time on land and Universal Time/Greenwich Mean Time
- 1.6.4 Zone designations and local mean time
- 1.6.5 Nautical almanac and conversion of time
- 2 Seamanship
- 2.1 Basic seamanship
- 2.1.1 Need for seamanship skills
- 2.1.2 Layout of a typical ship and nautical terms
- 2.1.3 Miscellaneous ship terms
- 2.1.4 Nautical terms for shore facilities/construction
- 2.2 Ship’s construction
- 2.2.1 Materials
- 2.2.2 Hull construction
- 2.3. Ship’s organization
- 2.3.1 Command and control
- 2.3.2 Deck department
- 2.3.3 Watch keeping
- 2.4. Ropes and their usage
- 2.4.1 Construction of ropes
- 2.4.2 Types of rope – natural ropes
- 2.4.3 Types of rope – man-man (synthetic) ropes
- 2.4.4 Handling and care of ropes
- 2.4.5 Handling mooring lines
- 2.5 Basic knots, bends, hitches and splices
- 2.5.1 Whippings
- 2.5.2 Knots, bends and hitches
- 2.5.3 Making a line fast to a set of bitts
- 2.5.4 Splicing
- 2.5.5 Rigging
- 2.6 Safety
- 2.6.1 Watchkeeping
- 2.6.2 Steering
- 2.6.3 Emergency drills – man overboard
- 2.6.4 Emergency drills- shipboard fires
- 2.6.5 Ship disasters
- 2.7 Sea transport operations
- 2.7.1 Introduction
- 2.7.2 Types of trading vessels
- Passenger ships
- General cargo ships (break bulk ships)
- Container ships
- Ro-Ro vessels
- Dry bulk carriers
- Oil tankers
- Liquid gas carriers
- Reefers (refrigeration vessels)
- Heavy lift vessels
- Commercial fishing vessels
- 2.7.3 Harbour maintenance and support vessels
- Tugs
- Dredgers
- 3 Meteorology (weather at sea)
- 3.1 Meteorology for mariners
- 3.1.1 Sources of meteorological information
- 3.1.2 Meteorological instruments
- 3.1.3 The atmosphere
- 3.1.4 Weather signs at sea
- Humidity
- Clouds
- Fog and mist
- Rain, snow and hail
- Wind
- Atmospheric pressure, depressions and anti-cyclones
- Air masses and fronts
- 4 Communications
- 4.1 Introduction
- 4.2 Flags
- 4.3 Semaphore and flashing light
- 4.4 Pyrotechnics, amplified voice, ship’s siren and underwater telephone
- 4.5 Radio
- 4.6 Vessel identities, commonly used words or phrases, phonetic alphabet and time.