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.
Coryton
51° 30.7'N
0° 32.5'E
12:24
Sheerness
51° 26.8'N
0° 45.0'E
12:12
Southend
51° 31.7'N
0° 43.0'E
12:11
Shivering Sand
51° 29.9'N
1° 4.7'E
11:59
Greenock
55° 56.9'N
4° 44.6'W
11:55
Millport
55° 45.1'N
4° 55.8'W
11:49
Margate
51° 23.4'N
1° 22.8'E
11:47
Moray Firth
57° 36.0'N
4° 0.4'W
11:37
Cromarty Firth
57° 41.1'N
4° 2.1'W
11:33
Mistley Quay (River Stour)
51° 56.7'N
1° 4.8'E
11:30
Workington
54° 39.2'N
3° 34.7'W
11:27
Portpatrick
54° 50.4'N
5° 7.2'W
11:27
Dover
51° 7.6'N
1° 20.2'E
11:27
Walton-on-the-Naze
51° 50.7'N
1° 16.5'E
11:25
Barrow (Ramsden Dock Entrance)
54° 5.6'N
3° 13.5'W
11:24
Eastham
53° 19.5'N
2° 57.0'W
11:22
Cowes (Isle of Wight)
50° 46.1'N
1° 17.9'W
11:21
Roa Island
54° 4.2'N
3° 10.4'W
11:20
Southampton
50° 53.7'N
1° 24.3'W
11:19
Harwich
51° 56.8'N
1° 17.1'E
11:18
Portsmouth
50° 48.8'N
1° 6.1'W
11:16
Douglas
54° 8.9'N
4° 28.0'W
11:16
Dublin (North Wall)
53° 20.8'N
6° 13.5'W
11:16
Fleetwood
53° 55.1'N
3° 0.5'W
11:15
Dungeness
50° 54.8'N
0° 58.7'E
11:14
Heysham
54° 2.0'N
2° 55.5'W
11:14
Halfway Shoal
54° 1.4'N
3° 11.9'W
11:11
Birkenhead (Alfred Lock)
53° 24.3'N
3° 0.9'W
11:09
Liverpool (Princes Pier)
53° 24.4'N
3° 0.0'W
11:09
Littlehampton
50° 47.9'N
0° 32.5'W
11:08
Wick
58° 26.5'N
3° 4.9'W
11:07
Shoreham
50° 49.7'N
0° 14.9'W
11:06
Port Erin
54° 5.1'N
4° 46.3'W
11:05
Felixstowe
51° 57.5'N
1° 20.8'E
11:05
Newhaven
50° 46.9'N
0° 3.5'E
11:05
Liverpool (Gladstone Lock)
53° 27.0'N
3° 1.1'W
11:04
Lymington (Entrance)
50° 45.2'N
1° 31.4'W
11:02
Bangor (Down, Northern Ireland)
54° 40.0'N
5° 40.3'W
10:57
Hilbre Island
53° 23.1'N
3° 13.8'W
10:57
Larne
54° 50.9'N
5° 47.8'W
10:55
Belfast
54° 36.1'N
5° 55.2'W
10:54
Lerwick
60° 9.3'N
1° 8.4'W
10:45
Llandudno
53° 19.9'N
3° 49.5'W
10:41
Christchurch (Quay)
50° 43.8'N
1° 46.8'W
10:37
Holyhead
53° 19.4'N
4° 37.6'W
10:04
Bournemouth
50° 42.9'N
1° 52.5'W
9:24
Sullom Voe
60° 27.6'N
1° 18.1'W
9:13
Lowestoft
52° 28.3'N
1° 45.1'E
8:57
Gorleston (Great Yarmouth)
52° 34.3'N
1° 44.3'E
8:17
Barmouth
52° 43.1'N
4° 2.9'W
8:14
Londonderry
54° 59.5'N
7° 19.0'W
8:10
Aberystwyth
52° 24.4'N
4° 5.5'W
7:55
Kinlochbervie
58° 27.3'N
5° 2.8'W
7:10
Fishguard
52° 0.2'N
4° 58.6'W
7:09
Blacktoft
53° 42.4'N
0° 43.5'W
6:58
Avonmouth
51° 30.4'N
2° 43.2'W
6:57
Ullapool
57° 53.7'N
5° 9.4'W
6:55
Coleraine (River Bann Entrance)
55° 10.2'N
6° 46.4'W
6:50
Stornoway
58° 12.3'N
6° 23.3'W
6:49
Portrush
55° 12.3'N
6° 39.6'W
6:47
Newport
51° 32.7'N
2° 59.2'W
6:44
Portland
50° 35.6'N
2° 26.2'W
6:40
Weymouth
50° 36.4'N
2° 27.0'W
6:36
King's Lynn
52° 45.3'N
0° 23.4'E
6:34
Cromer
52° 56.1'N
1° 17.7'E
6:30
West Stones (River Great Ouse)
52° 49.7'N
0° 21.5'E
6:19
Hinkley Point
51° 13.0'N
3° 7.4'W
6:19
St. Helier
49° 10.5'N
2° 7.0'W
6:18
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
Minehead
51° 12.9'N
3° 28.3'W
6:11
Hunstanton
52° 56.4'N
0° 29.2'E
6:11
Malin Head
55° 19.8'N
7° 22.4'W
6:07
Roaring Middle Light (Wash)
52° 58.6'N
0° 20.9'E
6:04
Hull
53° 44.3'N
0° 19.9'W
5:59
Milford Haven
51° 42.2'N
5° 3.2'W
5:58
Swansea
51° 36.5'N
3° 55.7'W
5:57
Mumbles
51° 34.2'N
3° 58.4'W
5:57
Gibraltar Point
53° 5.3'N
0° 20.0'E
5:54
Torquay
50° 27.5'N
3° 31.7'W
5:51
Tobermory
56° 37.3'N
6° 3.9'W
5:49
Skegness
53° 8.7'N
0° 20.9'E
5:47
Oban
56° 24.8'N
5° 28.6'W
5:38
Boygrift
53° 17.7'N
0° 19.2'E
5:38
Ilfracombe
51° 12.6'N
4° 6.6'W
5:36
Inner Dowsing Light
53° 19.0'N
0° 35.0'E
5:35
Immingham
53° 37.9'N
0° 11.2'W
5:35
Barrow Bridge
52° 16.8'N
7° 0.2'W
5:25
Rosslare Harbour
52° 15.4'N
6° 20.3'W
5:25
Plymouth (Devonport)
50° 22.9'N
4° 10.8'W
5:19
Tarbert Island (River Shannon)
52° 35.2'N
9° 21.5'W
5:17
Bull Sand Fort
53° 33.7'N
0° 4.1'E
5:16
Ringaskiddy
51° 49.9'N
8° 19.4'W
5:15
Spurn Point
53° 34.2'N
0° 6.4'E
5:12
Cobh
51° 51.0'N
8° 17.8'W
5:09
Falmouth
50° 9.4'N
5° 4.2'W
5:02
Newquay
50° 25.1'N
5° 5.2'W
4:53
Galway
53° 16.1'N
9° 2.9'W
4:50
Withernsea
53° 43.6'N
0° 2.6'E
4:37
Newlyn
50° 6.1'N
5° 32.9'W
4:36
St. Mary's
49° 55.0'N
6° 18.7'W
4:31
Cork (City)
51° 54.0'N
8° 27.3'W
4:15
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
Port Ellen (Islay)
55° 37.6'N
6° 11.3'W
3:07
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
London Bridge
51° 30.5'N
0° 5.3'W
1:10
Aberdeen
57° 8.7'N
2° 3.6'W
0:50
North Woolwich
51° 29.9'N
0° 3.6'E
0:44
Tilbury
51° 27.3'N
0° 20.3'E
0:18