f ) Place: Port Fitzroy 10
Date Thursday, 12th September
Time: 2045 SPDST Will Tower Rock (45°39´.70N 005°46´.70W) be covered or uncovered at 2045 SPDST?
In some instances local tide tables may be available for smaller, secondary ports. However, most almanacs tend to use a system that applies differences to a standard port’s tidal information to arrive at the times and heights for a secondary port.
Using the appropriate differences, answer the following secondary port tidal height questions: a) Place: Endal Marina
Date: Saturday, 2nd February Time: 1700 UT
What will the height of tide be at Endal Marina on Saturday, 2nd February at 1700 UT? What will the depth of water be over the sill at the entrance to Endal Marina at this time on Saturday, 2nd February?
b) Place: Farlow Date: Friday, 30th August Time: 1340 DST
What will the height of tide be at Farlow on Friday, 30th August at 1340 DST? i) What clearance will there be under the rail bridge at this time on Friday, 30th August? ii) What depth of water will there be off the Upper Town Quay at the same time?
c) Place: Parvin Sound Date: Tuesday, 16th July Time: 1800 DST
What will the height of tide be at Parvin Sound on Tuesday, 16th July at 1800 DST? At this time on Tuesday, 16th July the crew of a vessel, draught 1.3m, are preparing to anchor in Parvin Sound. In what depth of water should the vessel be anchored to ensure a clearance of 2.0m below the
keel at the next low water? d) Place: Port Slade
Date: Thursday, 23rd May Time: 1240 SPDST
What will the height of tide be at Port Slade on Thursday, 23rd May at 1240 SPDST? At this time on Thursday, 23rd May a vessel approaching Port Slade runs aground on the falling tide. At what time on the rising tide will the vessel re-float?
e) Place: Suzy Bay Marina Date: Wednesday, 26th June Time: 1100 DST
What will the height of tide be at Suzy Bay Marina on Wednesday, 26th June at 1100 DST? What will be the depth of water at the shallowest spot (1.2m) between Little Ryes island and the mainland at this time on Wednesday, 26th June? Use the differences for Suzy Bay Marina.
f ) Place: Stevenstown Date: Monday, 22nd July Time: 1320 DST
What will the height of tide be at Stevenstown on Monday, 22nd July at 1320 DST? If a vessel picked up a mooring off Stevenstown at this time when the depth of water was 5.0m, what would the depth of water be at the next low water?
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