SRBNAV 001B ELEMENTARY NAVIGATION
Field Navigation
DESCRIPTION:This unit involves the skills and knowledge required to perform navigational duties as a Marine Radio Base Operator. This includes the use of navigational charts in plotting positions, laying off courses, applying variation and measuring distance. Also included are time, speed and distance calculations and identification of chart symbols. It also includes reliably and accurately calculating heights and times of tides in accordance with official tide charts.
This unit is consistent with the requirements of the State Rescue Policy for Marine Radio Base Operators.
ELEMENT
/PERFORMANCE CRITERIA
1. Use a navigationalchart / a. Identify and plot positions by Latitude and Longitude
b. Lay off True Courses
c. Calculate and apply variation to True Courses
d. Measure distance in nautical miles using the appropriate latitude scale
e. Identify chart symbols
2. Navigation Lights / a. Identify navigation lights and shapes under IALA Buoyage System ‘A’
b. Identify and explain the arcs of visibility and the different navigation lights displayed by vessels in accordance with the International Rules for Prevention of Collisions at Sea
3. Time, speed and distance calculations / a. Calculations are made in relation to estimated time of arrival of a vessel to a predetermined position at a constant speed
b. Calculations are made to determine the speed required to arrive at a predetermined position at a certain time
4. Obtain tidal information / a. Local tide tables are used to determine times and heights of low and high tides.
b. Depths of water at locations on a coastal chart is estimated using charted depth and tidal information
Range Of Variables
VARIABLE
/SCOPE
1. General context
/ a. Work to be carried out in accordance with current and relevant navigational practiceb. Work is performed independently within a broad range of operational and routine requirements. It involves the interpretation of navigational information received and the application and transfer of such information as required
2. Worksite environment /
a. Any Marine Radio Base or Search and Rescue Coordination Centre accredited with the State Rescue Board of NSW.
b. Instrumentation and equipment used for desktop navigation may include:Parallel or roller rulers
Dividers and drawing compasses
Douglas protractors
Non-programmable calculators
Portland Navigational triangle
c. Equipment used for Navigation lights and buoyage may include:
Models of the IALA Buoyage system
Ships models displaying arcs of visibility
Actual navigation lights used on vessels
Flip cards displaying navigation lights
3. Sources of information/ documents / a. Sources of information and documentation may include:
Standard Operating Procedures of the Squad or Unit
Navigational charts of near coastal waters pertaining to the local area
Navigational, meteorological and oceanographic publications
Chart 5011, Chart Symbols and Abbreviations
Annual and weekly notices to mariners
Publications from the Australian Hydrographer including radio signals, light lists, sailing directions
Chart catalogues
Time, speed, distance tables
International Rules for the Prevention of Collisions at Sea
IALA Buoyage System ‘A’
Australian National Tide Tables
Evidence Guide
1. Critical aspects of evidence to be considered / a. Assessment must confirm appropriate knowledge and skills to:
Plot the position of a vessel on a navigational chart given latitude and longitude, two or more compass bearings, two or more ranges or a combination thereof
Lay off the true course on a chart. Calculate and apply the relevant variation to obtain a course to steer
Understand the navigational safety consequences of estimating bearing and courses without compass error information
Measure the distance from one position to the next.
Calculate ETA over a known distance and speed required to reach required positions
Understand the accuracy and errors associated with GPS positions
Understand the relevance of Buoyage system ‘A’
Determine the times and heights of tides locally
2. Interdependent assessment of units / a. This unit of competency must be assessed in conjunction with other mandatory units that form part of the job role of a Marine Radio Base Operator.
3. Required knowledge and skills / a. Procedures for filing and handling navigational charts, nautical publications and related documentation in serviceable condition
b. Principles and procedures for plotting a vessel’s position
c. Errors in common position fixing systems and methods and there effect on observed positions
d. Position fixing problems that may be experienced by small vessels at sea and appropriate action and solutions
e. Aspect and direction of travel of approaching vessels after interpretation of displayed navigation lights
f. Procedures for the calculation of height and time of low and high water at locations listed in the tide tables
4. Resource implications / a. Access to appropriate navigational equipment is required for opportunities to practice navigational plotting, calculations and information gathering.
Evidence Guide (continued)
5. Consistency in performance / a. Applies underpinning knowledge and skills when:
Using navigational instruments to plot positions, lay off courses and measure distance
Using land based instruments to collect basic meteorological data
Applying time, speed, distance formulas
Calculating depth of water from charted depth and height of tide
b. Shows evidence of application of relevant workplace and regulatory procedures including:
Any relevant legislation or regulation
Standard Operating Procedures of the squad or unit
Current NOTOPs
Use of relevant navigational publications and charts
6. Context for assessment / a. Assessment of competence must comply with the assessment requirements of current navigational practices
b. Assessment of this unit must be undertaken by a registered training organisation:
As a minimum, assessment of knowledge must be conducted through an appropriate written examination
KEY COMPETENCIES
Collect, Analyse & Organise Information / Communicate Ideas & Information / Plan & Organise Activities / Work with Others & in Teams / Use Mathematical Ideas & Techniques / Solve Problems / Use Technology
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SRBNAV 001B – Elementary Navigation V1