1. Causes and tidal heights
Tides
Causes and tidal heights
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2. Causes Gravitational pull of moon and sun on earth’s surface
New moon or full moon – pull in line with sun – spring tides
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3. Spring Tides Bay fo Fundy Canada 15m range 14/04/2019
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4. Neap Tides
Moon in it’s first or last quarter – pull at right angles to the sun
Neap tides
Small range
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5. Other effects on tide Air pressure (barometric pressure)
Onshore or offshore winds
Rain in river estuary
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6. Geographical location
Bay of Fundy Canada
Range of 15m
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7. Tidal terms
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8. Tidal terms - HAT Heights of bridges, wires etc. -
Now measured above highest astronomical tide
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9. Tidal information Tide tables Almanac Local tables Newspaper
Chartplotter
Can get info well in advance
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10. Looking up the tide Having found required port Go to date required
Check whether it is summer time or winter
Add on hour if necessary
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11. Time and height for day Look up tides for today
Make sure you know tide times every time you go afloat!
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12. 18 TIDE TABLE 0456 5.8 m 1205 1.7 m 1727 5.9 m Range HW 4.1 LW metresTH m m m HW LW
Range
4.1
metres
GMT
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13. 18 TIDE TABLE 0556 5.8 m 1305 1.7 m 1827 5.9 m Add an hour forTH m m m
Add an hour for
British Summer Time
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14. Tide Level Tables Found on charts Give info for ports on chart HAT
MHWS
MHWN
MLWN
MLWS
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15. RULE OF TWELFTHS 1st hour 1/12 2nd hour 2/12 3rd hour 3/12
4th hour 3/12
5th hour 2/12
6th hour 1/12
HW h h h h h LW
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