Tide clocks and watches are practical ways of indicating the state of the tide, in addition to consulting local tide tables.
Most tide clocks work by using a 12 hour 25 minute cycle. Generally in the UK and Ireland they vary in accuracy between plus or minus 30 minutes over a 30-day period. Therefore it is necessary to reset them using local tide tables every month or so.
Some watches with a moon/tide mode require lunitidal intervals so that they can indicate high and low waters. There are two definitions for this interval, which depends on whether adjacent high waters, or the mean of high waters over a lunar month are being considered.
The mean lunitidal intervals (mean high water intervals) are calculated using this equation:
Use the values from the table to set the moon/tide mode of your watch. These values should be sufficient information for watches that use the lunitidal interval to indicate high and low waters. Click on the column headings to sort the values – the default order of the following list is by adjacent locations around the coast.
St. Mary's
49° 55.0'N
6° 18.7'W
4:31
Newlyn
50° 6.1'N
5° 32.9'W
4:36
Falmouth
50° 9.4'N
5° 4.2'W
5:02
Plymouth (Devonport)
50° 22.9'N
4° 10.8'W
5:19
Torquay
50° 27.5'N
3° 31.7'W
5:51
Portland
50° 35.6'N
2° 26.2'W
6:40
Weymouth
50° 36.4'N
2° 27.0'W
6:36
Bournemouth
50° 42.9'N
1° 52.5'W
9:24
Christchurch (Quay)
50° 43.8'N
1° 46.8'W
10:37
Lymington (Entrance)
50° 45.2'N
1° 31.4'W
11:02
Cowes (Isle of Wight)
50° 46.1'N
1° 17.9'W
11:21
Southampton
50° 53.7'N
1° 24.3'W
11:19
Portsmouth
50° 48.8'N
1° 6.1'W
11:16
Littlehampton
50° 47.9'N
0° 32.5'W
11:08
Shoreham
50° 49.7'N
0° 14.9'W
11:06
Newhaven
50° 46.9'N
0° 3.5'E
11:05
Dungeness
50° 54.8'N
0° 58.7'E
11:14
Dover
51° 7.6'N
1° 20.2'E
11:27
Margate
51° 23.4'N
1° 22.8'E
11:47
Sheerness
51° 26.8'N
0° 45.0'E
12:12
Southend
51° 31.7'N
0° 43.0'E
12:11
Coryton
51° 30.7'N
0° 32.5'E
12:24
Tilbury
51° 27.3'N
0° 20.3'E
0:18
North Woolwich
51° 29.9'N
0° 3.6'E
0:44
London Bridge
51° 30.5'N
0° 5.3'W
1:10
Shivering Sand
51° 29.9'N
1° 4.7'E
11:59
Walton-on-the-Naze
51° 50.7'N
1° 16.5'E
11:25
Harwich
51° 56.8'N
1° 17.1'E
11:18
Mistley Quay (River Stour)
51° 56.7'N
1° 4.8'E
11:30
Felixstowe
51° 57.5'N
1° 20.8'E
11:05
Lowestoft
52° 28.3'N
1° 45.1'E
8:57
Gorleston (Great Yarmouth)
52° 34.3'N
1° 44.3'E
8:17
Cromer
52° 56.1'N
1° 17.7'E
6:30
Hunstanton
52° 56.4'N
0° 29.2'E
6:11
King's Lynn
52° 45.3'N
0° 23.4'E
6:34
West Stones (River Great Ouse)
52° 49.7'N
0° 21.5'E
6:19
West Lighthouse (River Nene)
52° 48.5'N
0° 12.6'E
6:17
Tabs Head (Rivers Witham/Welland)
52° 56.0'N
0° 5.0'E
6:13
Roaring Middle Light (Wash)
52° 58.6'N
0° 20.9'E
6:04
Gibraltar Point
53° 5.3'N
0° 20.0'E
5:54
Skegness
53° 8.7'N
0° 20.9'E
5:47
Boygrift
53° 17.7'N
0° 19.2'E
5:38
Inner Dowsing Light
53° 19.0'N
0° 35.0'E
5:35
Spurn Point
53° 34.2'N
0° 6.4'E
5:12
Bull Sand Fort
53° 33.7'N
0° 4.1'E
5:16
Immingham
53° 37.9'N
0° 11.2'W
5:35
Hull
53° 44.3'N
0° 19.9'W
5:59
Blacktoft
53° 42.4'N
0° 43.5'W
6:58
Withernsea
53° 43.6'N
0° 2.6'E
4:37
Scarborough
54° 16.9'N
0° 23.4'W
3:49
Whitby
54° 29.6'N
0° 36.8'W
3:35
River Tees (Entrance)
54° 38.9'N
1° 8.9'W
3:18
North Shields (River Tyne)
55° 0.6'N
1° 25.8'W
3:04
Leith
55° 59.4'N
3° 11.0'W
1:54
Rosyth
56° 1.3'N
3° 26.7'W
1:53
Aberdeen
57° 8.7'N
2° 3.6'W
0:50
Moray Firth
57° 36.0'N
4° 0.4'W
11:37
Cromarty Firth
57° 41.1'N
4° 2.1'W
11:33
Wick
58° 26.5'N
3° 4.9'W
11:07
Lerwick
60° 9.3'N
1° 8.4'W
10:45
Sullom Voe
60° 27.6'N
1° 18.1'W
9:13
Kinlochbervie
58° 27.3'N
5° 2.8'W
7:10
Stornoway
58° 12.3'N
6° 23.3'W
6:49
Ullapool
57° 53.7'N
5° 9.4'W
6:55
Tobermory
56° 37.3'N
6° 3.9'W
5:49
Oban
56° 24.8'N
5° 28.6'W
5:38
Port Ellen (Islay)
55° 37.6'N
6° 11.3'W
3:07
Millport
55° 45.1'N
4° 55.8'W
11:49
Greenock
55° 56.9'N
4° 44.6'W
11:55
Portpatrick
54° 50.4'N
5° 7.2'W
11:27
Workington
54° 39.2'N
3° 34.7'W
11:27
Barrow (Ramsden Dock Entrance)
54° 5.6'N
3° 13.5'W
11:24
Roa Island
54° 4.2'N
3° 10.4'W
11:20
Halfway Shoal
54° 1.4'N
3° 11.9'W
11:11
Heysham
54° 2.0'N
2° 55.5'W
11:14
Fleetwood
53° 55.1'N
3° 0.5'W
11:15
Liverpool (Gladstone Lock)
53° 27.0'N
3° 1.1'W
11:04
Liverpool (Princes Pier)
53° 24.4'N
3° 0.0'W
11:09
Birkenhead (Alfred Lock)
53° 24.3'N
3° 0.9'W
11:09
Eastham
53° 19.5'N
2° 57.0'W
11:22
Hilbre Island
53° 23.1'N
3° 13.8'W
10:57
Douglas
54° 8.9'N
4° 28.0'W
11:16
Port Erin
54° 5.1'N
4° 46.3'W
11:05
Llandudno
53° 19.9'N
3° 49.5'W
10:41
Holyhead
53° 19.4'N
4° 37.6'W
10:04
Barmouth
52° 43.1'N
4° 2.9'W
8:14
Aberystwyth
52° 24.4'N
4° 5.5'W
7:55
Fishguard
52° 0.2'N
4° 58.6'W
7:09
Milford Haven
51° 42.2'N
5° 3.2'W
5:58
Mumbles
51° 34.2'N
3° 58.4'W
5:57
Swansea
51° 36.5'N
3° 55.7'W
5:57
Newport
51° 32.7'N
2° 59.2'W
6:44
Avonmouth
51° 30.4'N
2° 43.2'W
6:57
Hinkley Point
51° 13.0'N
3° 7.4'W
6:19
Minehead
51° 12.9'N
3° 28.3'W
6:11
Ilfracombe
51° 12.6'N
4° 6.6'W
5:36
Newquay
50° 25.1'N
5° 5.2'W
4:53
Dublin (North Wall)
53° 20.8'N
6° 13.5'W
11:16
Bangor (Down, Northern Ireland)
54° 40.0'N
5° 40.3'W
10:57
Belfast
54° 36.1'N
5° 55.2'W
10:54
Larne
54° 50.9'N
5° 47.8'W
10:55
Portrush
55° 12.3'N
6° 39.6'W
6:47
Coleraine (River Bann Entrance)
55° 10.2'N
6° 46.4'W
6:50
Londonderry
54° 59.5'N
7° 19.0'W
8:10
Malin Head
55° 19.8'N
7° 22.4'W
6:07
Galway
53° 16.1'N
9° 2.9'W
4:50
Tarbert Island (River Shannon)
52° 35.2'N
9° 21.5'W
5:17
Cork (City)
51° 54.0'N
8° 27.3'W
4:15
Cobh
51° 51.0'N
8° 17.8'W
5:09
Ringaskiddy
51° 49.9'N
8° 19.4'W
5:15
Barrow Bridge
52° 16.8'N
7° 0.2'W
5:25
Rosslare Harbour
52° 15.4'N
6° 20.3'W
5:25
St. Helier
49° 10.5'N
2° 7.0'W
6:18