IN NORTHERN EUROPE, ‘Will we go aground?‘ is probably the most frequently asked question, because the rise and fall of the tide here influences just about everything we do on the water. Having the ability to work out how high the tide is at any given time, and subsequently how fast the water is moving, is vital for successful navigation and pilotage.
Tidal theory is very complicated and there are many aspects that even the experts fail to understand, so when we talk about the causes of tides in this chapter it is with a very simplistic view. Fortunately, because things astronomical are so very predictable, there is much reliable data to assist with any calculations.
Here you will find attached, a relative pdf and an exercise with the answer.
Ask me for more exercises at adonyacht@gmail.com or through the www.adonboard.gr
You will also find answers to the following questions:
1)Why good knowledge of tides is fundamental?
2)Why tidal streams are important?
3)How the time of the early morning high-water moves back each day?
4)How the heights of high and low water change each day?
Exercise
Use the tidal stream atlas in the Training Almanac to obtain the set and drift at the following locations: Set (ºT) Drift (Kts)
a) Between the islands of Potta and Strong Holm, 6 hours before HW Victoria at neaps.
Set (ºT) Drift (Kts)
b) 2 miles southwest of Cape Woodward, 4 hours before HW Victoria at springs.
Set (ºT) Drift (Kts)
c) East of Dymond Reef, 1 hour before HW Victoria halfway between springs and neaps.
Set (ºT) Drift (Kts)
source:KipperSailing
Answers
