Nautical Science P1 Memo 2018 hlayiso.com

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE EXAMINATION NOVEMBER 2018 NAUTICAL SCIENCE: PAPER I MARKING GUIDELINES Time: 3 hours Marks: 150 These marking guidelines are prepared for use by examiners and sub-examiners, all of whom are required to attend a standardisation meeting to ensure that the guidelines are consistently interpreted and applied in the marking of candidates' scripts. The IEB will not enter into any discussions or correspondence about any marking guidelines. It is acknowledged that there may be different views about some matters of emphasis or detail in the guidelines. It is also recognised that, without the benefit of attendance at a standardisation meeting, there may be different interpretations of the application of the marking guidelines. IEB Copyright © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 2 of 8 SECTION A PRACTICAL CHART WORK QUESTION 1 Ship's Heading Robben Isl. Lt. Bearing Compass 132° 089° Deviation 9° W 9° W Magnetic 123° 080° Variation 24° W 24° W True 099° 056° 1.1 Course to make good 057° (T) See Chart SAN 3002 Course to counter the 047° (T) See Chart SAN 3002 current Leeway allowed 2° - (Wind W'ly) Course to steer 045° (T) Variation 24° W Magnetic course to 069° (M) steer Deviation 13° ½ W Compass course to 082° ½ (C) steer 1.2 Course from A/C to 090° (T) See Chart SAN 3002 Pilot 1.3 Dist. 05:00 to Pilot 11,0 M Time @ 8 kts 01h 22m 05 00 ETA Pilot 06 22 IEB Copyright © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 3 of 8 QUESTION 2 Simonsberg/Paulsberg 347°/167° brg. Base angle 90° – 63° 27° Brg. from Simonsberg 167° – 27° 140° Brg. from Paulsberg 347° + 27° 014° Paulsberg/Cape Point Lt. 336°/156° brg. Base angle 90° – 56° 34° Brg. from Cape Point Lt. 336° + 34° 010° Brg. from Paulsberg 156° – 34° 122° Chart work marks Anchor position: Lat. 34° 16,6'S Long. 018° 31,6'E or – Whittle Rk buoy brg. 049° × 2,9' or – Cape Point Lt. brg. 197° × 5,0' IEB Copyright © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 4 of 8 QUESTION 3 V/l Hdg. Brg. Brg. 16:30 17:00 Compass 335° (C) 027° (C) 076° (C) Deviation 4° E 4° E 4° E Magnetic 339° (M) 031° (M) 080° (M) Variation 24° W 24° W 24° W True 315° (T) 007° (T) 056° (T) Leeway (W'ly) 5° - Track (T) 320° (T) 3.1 Chartwork 3.2 The vessel will pass 1 mile NE of the 29 m depth. 3.3 The 29 m depth will be abeam at 19:20 IEB Copyright © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 5 of 8 QUESTION 4 4.1 Draught 5,00 Clearance 0,50 Depth required 5,50 Chart depth 4,00 Height of tide 1,50 required The earliest time to cross on the afternoon rising tide will be at 13:00 on Wednesday 28 November. 4.2 Chart datum is an arbitrarily fixed level at a port devised so that it is below low tide level (except for very low tides). All predicted tidal heights for any port are heights above chart datum for that particular port. Chart datum will be different for each port. (or similar definition) 4.3 (b) M.H.W.S. IEB Copyright © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 6 of 8 QUESTION 5 5.1 Robben Island light will display the following characteristics: • Occulting white light changing to red on its southern sector; • The frequency is 7 seconds; • Height is 47 metres above sea level; • Nominal range of the white light is 24 miles, and of the red light 12 miles. 5.2 The safe passage past Whittle Rock is to the east. The reason may be any one of the following: • It is an East Cardinal buoy identified by the top marks and light frequency. • The buoy is positioned to protect a shallow (breaks occasionally) patch of 3,6 m depth on the west side. 5.3 "Obsc" means obscure, and the dotted arc line adjacent denotes the arc of the circumference of Cape Point light which is obscured. 5.4 Variation for 1999 is 23° 32'W, increasing 2'W each year. Therefore the variation for 2014 will be 24° 02'W. (The answer may differ depending on the publication year of the chart, information will refer to the centre of the compass rose in False Bay) 5.5 "Ships replenishing stores off Table Bay should remain to the westward of the lines running in the north-north-westerly and south-westerly directions from a point 6 nautical miles west of Green Point Light." IEB Copyright © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 7 of 8 SECTION B ASTRO-NAVIGATION QUESTION 6 6.1 LMT Mer. Pass. 1 Dec. 11h 49' Long. 018° 10'E - 1h 13' (a) GMT Mer. Pass. 1 Dec. 10h 36' Zone GMT +1hr. 1h 00,0' (b) Mer. Pass. Zone time 11h 36' 6.2 Dec. at Mer. Pass. S 21° 47,9' Sext. Alt. 80° 41,7' Index error + 1,2' Observed altitude 80° 42.9' Dip - 6,1' Apparent altitude 80° 36,8' Total correction + 16,0' True altitude 80° 52,8' 90° 00,0' Zenith distance ZX 9° 07,2' Declination QX S 21° 47,9' Lat. S 12° 40,7' Position at Mer. Pass. 12° 40,7'S 018° 10,0'E. 6.3 05:00 Lat. 13° 45,5'S 11:36 Mer. Pass. 12° 40,7'S D'Lat. 1° 04,8'N Distance miles 64,8 M Time 05:00 to 11:36 6,6 hrs Speed 9,8 kts IEB Copyright © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 8 of 8 QUESTION 7 7.1 LMT 08h 30 00 Long. 044° 20'E 03h 00 00 GMT 05h 30 00 GHA 05h 00 257° 41,0 Dec. S 21° 55,0 Inc. 32m 40s 7° 30,0 ‘d' 0,2 GHA 05h 32 40 2650 11,0 Dec. S 21° 55,2 Long. 044° 20,0 LHA 309° 31,0 A 0,42 N True brg. 095° (T) B 0,52 S Comp brg. 083° (C) C 0,10 S Compass 12° E error T Brg. S 85° E Ship's Hdg. 250° (C) T. Brg. 095° (T) True Hdg. 262° (T) 7.2 Compass error 12° E Var. 23° E Dev. 11° W Total: 150 marks IEB Copyright © 2018