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Springs or Neaps
To discover if a tide is a spring or neap we need to find the range of the tide. (It is not always possible to see the Moon’s phase.)
To find the range we subtract the low water height from the high water height.
Example
PNT (practice navigation tables) page 63
|
4th May |
Time 0638 |
0.7 m |
6.0 m range |
|
|
1118 |
6.7 m |
|
|
|
|
|
|
|
|
1855 |
0.8 m |
6.0 m range |
|
|
2337 |
6.8 m |
|
Therefore a range of tide of 6.0 m is a Spring tide at Dover.
EXERCISES
Are the ranges for the following tides, spring, neap, or in between.
| 1) Dover 3rd June | 0703 LW | 1115 HW |
| 2) Dover 4th July | 0833 LW | 1313 HW |
| 3) Dover 26th May | 1146 LW | 0502 HW |
| 4) Dover 25th June | 1202 LW | 0457 HW |
ANSWERS
1) 6.2 m springs
2) 6.4 m springs
3) 3.1 m neaps
4) 3.4 m neapish