Nautical Science P1 Memo 2019 hlayiso.com

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE EXAMINATION NOVEMBER 2019 NAUTICAL SCIENCE: PAPER I MARKING GUIDELINES Time: 3 hours 150 marks 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 © 2019 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 2 of 8 SECTION A PRACTICAL CHARTWORK QUESTION 1 1.1 Course Brg. of Robben Isl. Lt. 158° (C) 142° (C) Deviation 1° E 1° E 159° (M) 143° (M) Variation 24° W 24° W 135° (T) 119° (T) Course to make good 144° (T) Course to counter current 139° (T) Leeway (W) 7° + Course to steer 146° (T) Var 24° W Magnetic course 170° (M) Dev 2° E Compass course to steer 168° (C) Chart 1.2 Course to the pilot station 090° 4,6 miles. IEB Copyright © 2019 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 3 of 8 QUESTION 2 2.1 Simonsberg/Else Pk 90° – 75° = 15° brg 358°/178° Simonsberg 358° + 15° = 013° Else Pk 178° – 15° = 163° Else Pk/Kalkbaaiberg 90° – 43° = 47° brg 185°/005° Else Pk 005° + 47° = 052° Kalkbaaiberg 185° – 47° = 138° Anchor position Roman Rocks Lt. brg. 211° × 1,5' CHART 2.2 Simon's Town breakwater light brg. 224° × 2,3' Kalkbaai breakwater light brg. 330° × 2,2' Nearest point of land Else Pk. Quarry radar range 1,7' Seal Island nearest radar range 5,5' Whittle Rock Racon 137° × 7,2' Or any three of the above 2.3 Radar, compass bearings, echo sounder, GPS. Any two of the above IEB Copyright © 2019 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 4 of 8 QUESTION 3 Course 10:00 11:00 Compass 150° 070° 010° Dev 0° 0° 0° Magnetic 150° 070° 010° Var 24° W 24° W 24° W True 126° 046° 346° Position at 11:00 Cape Point Lt brg 346° (T) × 7,1' Lat 34° 28,3' S Long 018° 31,9' E Chart IEB Copyright © 2019 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 = 2,62 m Clearance = 1,50 Depth required = 4,12 Chart depth = 2,50 Height of tide = 1,62 m From the Tide Tables, cross at 15h 30m on 25 December 4.2 4.2.1 Spring tide occurs at: Full moon when the attractive forces of the sun and moon combine. New moon when the sun and moon are in conjunction. 4.2.2 Neap tide occurs at: Moon's 1st quarter when the gravitational forces are acting at 90°. Moon's 3rd quarter when the sun and moon are in quadrature. IEB Copyright © 2019 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 6 of 8 QUESTION 5 5.1 Kaap Hangklip Lt. (Fl. 10s 34m 25M) Flash white light with a frequency of 10 seconds Height of light 34 meters above MHWS Range of visibility 25 miles 5.2 Cape Point light southern range shows (F. R. 77m 15M) Fixed red light Height of light 77 meters above MHWS Range of visibility is 15 miles 5.3 No. 4 Anchorage Hazardous Block e.g. Breakwater Lt. brg 177° × 3,7' Or similar position within the limits of No. 4 Anchorage + water depth 5.4 1 852 metres 5.5 0,9 miles IEB Copyright © 2019 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 LMT 09h 52m GHA = 299° 04,0' Dec = 12° 54,9' N 08:00 Long 15° 10' E 01 01 Inc 51 m = 12° 45,0' 'd' = 0,7' - GMT 08h 51m GHA = 311° 49,0' Dec = 12° 54,2' N 08:51 Long = 15° 10,0' 15°10' LHA = 326° 59,0' (5) A = 0.819 N True brg 042 1/2° B = 0.421 N Compass brg 069° C = 1.240 N Error 26 1/2° W Az. = N 42 1/2° E 042 1/2° 6.1 6.2 Compass Hdg 340° Compass error 26 1/2° W Compass error 26 1/2° W Var 23° W True heading 313 1/2° Deviation 3 1/2° W IEB Copyright © 2019 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: NAUTICAL SCIENCE: PAPER I – MARKING GUIDELINES Page 8 of 8 QUESTION 7 7.1 7.1.1 LMT Mer Pass 12h 04m Long 4 38 + 069°30'W GMT Mer 16h 42m (7.1.1) Pass Zone 5 00 – Zone time MP 11h 42m (7.1.1) 7.1.2 Sext Alt = 72° 51,2' Dec 13° 07,9' N i.e. (off) = 1,5' + 'd' 0,6' – Obs Alt = 72° 52,7' Dec 13° 07,3' N dip (12,5m) = 6,2' – App Alt = 72° 46,5' Total corr = 15,6' + True alt = 73° 02,1' 90° 00,0' ZX = 16° 57,9' Dec = 13° 07,3' N Lat. = 30° 05,2' N (7.1.2) 7.2 Total: 150 marks IEB Copyright © 2019