Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of: celestial observations and calculations, including: celestial sphere and equinoctial system of co-ordinates compass error using azimuth and amplitude daily motion and horizontal system of co-ordinates hour angle latitude by meridian altitude pole star observations sextant and altitude corrections solar system time and equation of time characteristics of the various weather systems, reporting procedures and recording systems charted information, including that in the title block, zones of confidence diagrams and datums compass error from transit bearings or by bearings taken from a known position times and heights of high and low water from Australian or local tide tables for primary and secondary ports and the relevance of chart datum effects of current and leeway on the course and speed of the vessel (without calculations) finding the variation from the chart fixing vessel position by: radar ranges and bearings simultaneous bearings, transits of coastal features, and running fix hazards, including: restricted visibility shallow water traffic unlit beacons interpreting the set and drift of the current from information available on the chart maintaining information in a navigational log and voyage records measuring distance on a chart meteorological instruments and their use meteorological terms nautical charts and publications navigation systems, performance checks and tests to comply with manufacturers’ recommendations and good navigation practice plane, Mercator and GCS concepts and calculations principles of magnetic and gyrocompasses and fluxgate compass relationship between compass, magnetic, true and gyro-courses and bearings relative bearings selection of suitable points for bearings sources of weather forecasts and the interpretation of that information steering control systems, including operating procedures theory of tides use and limitations on the use of electronic position fixing equipment, including: augmented satellite systems enhance loran-C system global navigation satellite system (GNSS) and Galileo global navigation system (GNS) and global positioning system (GPS) loran-C system use of a deviation card using a single position line to assist in clearing dangers using modern electronic navigational aids to determine vessel position using meteorological information available, including: atmospheric pressure cloud precipitation recording and reporting weather observations structure of depressions tropical revolving storms and other pressure systems visibility weather services for shipping wind and other pressure systems over the ocean using soundings in determining position using terrestrial observations to determine vessel position individually or in combination with other methods work health and safety (WHS)/occupational health and safety (OHS) requirements and work practices. |