Chartwork 1st Class

1
Chartwork 1st Class
Tides
(Adapted from RYA Shorebased slides)
2
What Causes Tides?
Gravitational effects of the moon (and sun) which
exert a pull on the water on the Earth's
surface. What terms have you heard relating to
tides?
Spring
High
Stand
Flood
Ebb
Slack
Range
Low
Neap
3
(No Transcript)
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
(No Transcript)
8
(No Transcript)
9
(No Transcript)
10
(No Transcript)
11
TIDAL DIAMONDS DATUMS
Tidal streams referred to HW at PLYMOUTH
12
(No Transcript)
13
TIDAL CURVE
14
TIDAL CURVE
Use curve to find Height of tide at Dartmouth at
1415
Look up time and height of HW Dartmouth and
height of LW HW Dartmouth 1815 BST 4.8m LW
0.7m Is it Neaps or Springs? Close to Springs
15
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
(No Transcript)
19
TIDAL CURVE
HW Dartmouth 1815 BST 4.8m LW 0.7m
Draw vertical line from 1415 to spring curve
1415 1515 1615 1715 1815
20
(No Transcript)
21
(No Transcript)
22
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 1h 2h 3h 4h 5h
LW
23
(No Transcript)
24
SECONDARY PORTS - TIMES HEIGHTS
25
INTERPRETING THE 'DIFFERENCES BLOCK'
26
INTERPRETING THE 'DIFFERENCES BLOCK'
27
INTERPRETING THE 'DIFFERENCES BLOCK'
28
(No Transcript)
29
(No Transcript)
30
(No Transcript)
31
(No Transcript)