10. On Saturday, 5th October at 1333 DST a boat is preparing to anchor in Namley Harbour. a) Calculate the height of tide at 1333 DST. b) How much will the tide fall between 1333 DST and LW?


c) The boat has a draught of 1.7m. What is the minimum depth of water to anchor in at 1333 DST to give 1.0m clearance at LW?


11. At 1155 DST on Thursday, 6th June a skipper has picked up a mooring in Namley Harbour. The depth of water at 1155 DST is 4.0m and the boat has a draught of 1.0m. What will the clearance be at LW?


12. A skipper is planning to leave North Namley Yacht Haven, in Namley Harbour. a) What is the least depth in the channel from the Yacht Haven? b) The boat has a draught of 2.1m and the skipper wishes to have a clearance of 1.0m. What height of tide is required?


c) What is the earliest time before HW that the boat can leave the yacht haven on the morning of Sunday, 8th September?


PART B - SECONDARY PORTS 1. Secondary port average HW tidal height corrections on Namley Harbour: Whale Bay


Rawmarsh Itchenham


- 6 mins - 5 mins + 15 mins


Port Rampton Farlow


Emsbourne


- 26 mins - 29 mins + 10 mins


Using the information in the table what is the time of high water: a) In the afternoon of Monday, 1st July at Emsbourne? b) During the midday period of Monday, 4th November at Farlow?


2. Rozelle Cove (page 65 of the RYA Training Almanac) is a secondary port. a) Which port is Rozelle Cove’s Standard Port? b) On the 29th January what is the time and height of HW in the Standard port and in Rozelle Cove? c) Give the following times and heights for Rozelle Cove: i) LW on the morning of Thursday, 11th April ii) HW in the early morning of Wednesday, 20th March


PART C - TIDAL STREAMS Use RYA Chart 4 and the tidal stream atlas in the RYA Almanac


1. What is the direction and rate of the tidal stream at tidal Diamond F: a) At HW Victoria during spring tides? b) Four hours before HW Victoria during neap tides? c) Two hours after HW Victoria during mid-range tides?


2 What is the direction and rate of the tidal stream at tidal Diamond A: a) On Tuesday, 3rd September between 0634 DST and 0734 DST? b) On Saturday, 7th December between 1436 UT and 1536 UT?


3. Use the tidal stream atlas:


a) What is the direction and rate of the tidal stream at springs three hours after HW Victoria, south of Port Fraser?


b) What is the direction and rate of the tidal stream in the entrance to Namley Harbour on Saturday, 6th April between 0757 DST and 0857 DST?


c) A skipper wakes up at 0800 UT on the morning of the 15th February and decides to plan a passage from Hamilton Sound towards Sweetwater. When does the tidal stream become favourable to assist him?


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