SAMSA Skipper Category B (Coastal, up to 40 nm) Exam (South Africa) common mistakes
SAMSA Skipper Category B (Coastal, up to 40 nm) Exam (South Africa) · Understand the traps and how to avoid them.
Applying variation and deviation with the wrong sign or in the wrong order when converting between true, magnetic and compass bearings, so the plotted course is off by the sum instead of the difference.
Candidates memorise 'variation east, magnetic least' as a chant without a picture of the relationship, and rush the arithmetic under time pressure, especially when the bearing crosses north (e.g. 350° with 15°E variation).
What to do instead
Before the exam, drill a fixed routine: write T-V-M-D-C on the answer sheet, draw the compass rose arrow for the stated variation direction, and do every conversion both ways as a self-check. Work three north-crossing examples until the wrap-around is automatic.
Reading a position from the latitude and longitude scales but estimating the minutes by eye instead of measuring from the nearest whole-minute graticule line, producing a fix 0.5' or more out.
Candidates are used to GPS readouts and treat the chart scale as decorative; the minutes of latitude are subdivided only by the graticule and the dividers must be set against the side scale, not the top or bottom.
What to do instead
Practise with dividers on a training chart: always measure latitude against the left or right scale and longitude against the top or bottom scale, and state the position to the nearest 0.1'. Do ten random fixes and check each against the chart's own graticule.
Treating a tidal height from the tide table as the depth of water available, without applying chart datum, charted depth, height of tide and under-keel clearance in the correct sequence.
The candidate confuses 'height of tide' with 'depth of water' and forgets that charted soundings are below chart datum, so the sums are done in the wrong order or a term is dropped.
What to do instead
Use a written template every time: charted depth + height of tide = depth of water; depth of water − draught − under-keel clearance = margin. Practise with a real South African standard port table and a secondary port difference until the template is automatic.
Planning a passage using a single rhumb-line track and ignoring the effect of a known current or leeway, so the estimated position drifts off the intended ground track.
Candidates plot the course to steer as if through still water and do not construct a course-to-steer triangle, because they have not practised setting a current vector from the tidal stream or current atlas.
What to do instead
Work through a full set-and-drift triangle: plot the water track, lay off the current vector for the passage duration, then measure the course to steer and speed made good. Do at least five such constructions with different current directions before the exam.
Misidentifying buoyage - for example treating an east cardinal mark as a north cardinal, or confusing port and starboard hand marks when entering a harbour - because the topmark shape and light characteristic are not recalled.
Candidates learn buoyage from memory of colour alone and do not link the topmark (two cones) and the light rhythm to the compass quadrant, which is exactly what the exam tests.
What to do instead
Build a one-page table of cardinal marks with cone orientation, colour pattern and light characteristic (Q, VQ, Q(3), Q(6)+LFl) and redraw it from memory daily. Then apply it to a chart of a South African harbour entrance.
Answering collision-regulation questions by 'common sense' rather than by the specific rule - for example saying the give-way vessel always turns to starboard, or that a power-driven vessel always gives way to a sailing vessel regardless of the situation.
Candidates rely on general boating experience and do not know the rule numbering, so they miss the exceptions (overtaking, narrow channels, traffic separation schemes, vessels restricted in ability to manoeuvre).
What to do instead
Learn the rules by number and by scenario: for each rule, write one line on when it applies and one on the action required. Practise 'who gives way and what action' scenarios covering head-on, crossing, overtaking, and a vessel not under command.
Confusing the distress signal, the urgency signal and the safety signal, or transmitting a Mayday call without the required content (position, nature of distress, number of persons, assistance required).
Candidates memorise the words 'Mayday, Pan Pan, Securite' but never rehearse the full call structure, so under exam pressure they omit position or persons on board.
What to do instead
Write out and memorise the full Mayday, Pan Pan and Securite proformas, including the 'this is' station identification, position in latitude and longitude, and the 'over' at the end. Rehearse each aloud until it is fluent without notes.
Giving a latitude and longitude or a bearing in the wrong format on the radio or in the log - mixing degrees and decimal minutes with degrees, minutes and seconds, or omitting the hemisphere letters.
Candidates are used to app displays and have not been taught that maritime voice procedure uses degrees and minutes (and decimals of a minute) with N/S and E/W stated.
What to do instead
Adopt one format - degrees and decimal minutes with hemisphere - and use it in every written answer and every spoken drill. Convert five positions from one format to the other as a warm-up before the exam.
Ignoring local South African regulation differences - such as skipper certification and vessel category limits, required safety equipment for the area of operation, or reporting requirements - and answering from general international practice.
Candidates study generic RYA or international material and assume it applies unchanged, missing the SAMSA-specific categories, equipment lists and local by-laws tested in this paper.
What to do instead
Work directly from the current SAMSA Category B syllabus, the applicable merchant shipping notices and the local port rules, and make a checklist of equipment and limits by category. Test yourself by category rather than by topic.
Treating an electronic chart plotter or GPS position as automatically correct and not cross-checking it against a visual fix, transit or depth sounding, so a datum or configuration error goes unnoticed.
Candidates trust the display and do not understand chart datum offsets, GPS antenna offset, or the difference between WGS84 and chart datum, which the exam probes with 'what would you check' questions.
What to do instead
Learn the cross-check routine: compare the plotter position with a visual bearing and distance, a transit, and the echo sounder against the charted depth plus tide. Practise explaining, in writing, how you would detect a 0.2 nm offset.