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.
Aberdeen
57° 8.7'N
2° 3.6'W
0:50
Aberystwyth
52° 24.4'N
4° 5.5'W
7:55
Avonmouth
51° 30.4'N
2° 43.2'W
6:57
Bangor (Down, Northern Ireland)
54° 40.0'N
5° 40.3'W
10:57
Barmouth
52° 43.1'N
4° 2.9'W
8:14
Barrow (Ramsden Dock Entrance)
54° 5.6'N
3° 13.5'W
11:24
Barrow Bridge
52° 16.8'N
7° 0.2'W
5:25
Belfast
54° 36.1'N
5° 55.2'W
10:54
Birkenhead (Alfred Lock)
53° 24.3'N
3° 0.9'W
11:09
Blacktoft
53° 42.4'N
0° 43.5'W
6:58
Bournemouth
50° 42.9'N
1° 52.5'W
9:24
Boygrift
53° 17.7'N
0° 19.2'E
5:38
Bull Sand Fort
53° 33.7'N
0° 4.1'E
5:16
Christchurch (Quay)
50° 43.8'N
1° 46.8'W
10:37
Cobh
51° 51.0'N
8° 17.8'W
5:09
Coleraine (River Bann Entrance)
55° 10.2'N
6° 46.4'W
6:50
Cork (City)
51° 54.0'N
8° 27.3'W
4:15
Coryton
51° 30.7'N
0° 32.5'E
12:24
Cowes (Isle of Wight)
50° 46.1'N
1° 17.9'W
11:21
Cromarty Firth
57° 41.1'N
4° 2.1'W
11:33
Cromer
52° 56.1'N
1° 17.7'E
6:30
Douglas
54° 8.9'N
4° 28.0'W
11:16
Dover
51° 7.6'N
1° 20.2'E
11:27
Dublin (North Wall)
53° 20.8'N
6° 13.5'W
11:16
Dungeness
50° 54.8'N
0° 58.7'E
11:14
Eastham
53° 19.5'N
2° 57.0'W
11:22
Falmouth
50° 9.4'N
5° 4.2'W
5:02
Felixstowe
51° 57.5'N
1° 20.8'E
11:05
Fishguard
52° 0.2'N
4° 58.6'W
7:09
Fleetwood
53° 55.1'N
3° 0.5'W
11:15
Galway
53° 16.1'N
9° 2.9'W
4:50
Gibraltar Point
53° 5.3'N
0° 20.0'E
5:54
Gorleston (Great Yarmouth)
52° 34.3'N
1° 44.3'E
8:17
Greenock
55° 56.9'N
4° 44.6'W
11:55
Halfway Shoal
54° 1.4'N
3° 11.9'W
11:11
Harwich
51° 56.8'N
1° 17.1'E
11:18
Heysham
54° 2.0'N
2° 55.5'W
11:14
Hilbre Island
53° 23.1'N
3° 13.8'W
10:57
Hinkley Point
51° 13.0'N
3° 7.4'W
6:19
Holyhead
53° 19.4'N
4° 37.6'W
10:04
Hull
53° 44.3'N
0° 19.9'W
5:59
Hunstanton
52° 56.4'N
0° 29.2'E
6:11
Ilfracombe
51° 12.6'N
4° 6.6'W
5:36
Immingham
53° 37.9'N
0° 11.2'W
5:35
Inner Dowsing Light
53° 19.0'N
0° 35.0'E
5:35
King's Lynn
52° 45.3'N
0° 23.4'E
6:34
Kinlochbervie
58° 27.3'N
5° 2.8'W
7:10
Larne
54° 50.9'N
5° 47.8'W
10:55
Leith
55° 59.4'N
3° 11.0'W
1:54
Lerwick
60° 9.3'N
1° 8.4'W
10:45
Littlehampton
50° 47.9'N
0° 32.5'W
11:08
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
Llandudno
53° 19.9'N
3° 49.5'W
10:41
London Bridge
51° 30.5'N
0° 5.3'W
1:10
Londonderry
54° 59.5'N
7° 19.0'W
8:10
Lowestoft
52° 28.3'N
1° 45.1'E
8:57
Lymington (Entrance)
50° 45.2'N
1° 31.4'W
11:02
Malin Head
55° 19.8'N
7° 22.4'W
6:07
Margate
51° 23.4'N
1° 22.8'E
11:47
Milford Haven
51° 42.2'N
5° 3.2'W
5:58
Millport
55° 45.1'N
4° 55.8'W
11:49
Minehead
51° 12.9'N
3° 28.3'W
6:11
Mistley Quay (River Stour)
51° 56.7'N
1° 4.8'E
11:30
Moray Firth
57° 36.0'N
4° 0.4'W
11:37
Mumbles
51° 34.2'N
3° 58.4'W
5:57
Newhaven
50° 46.9'N
0° 3.5'E
11:05
Newlyn
50° 6.1'N
5° 32.9'W
4:36
Newport
51° 32.7'N
2° 59.2'W
6:44
Newquay
50° 25.1'N
5° 5.2'W
4:53
North Shields (River Tyne)
55° 0.6'N
1° 25.8'W
3:04
North Woolwich
51° 29.9'N
0° 3.6'E
0:44
Oban
56° 24.8'N
5° 28.6'W
5:38
Plymouth (Devonport)
50° 22.9'N
4° 10.8'W
5:19
Port Ellen (Islay)
55° 37.6'N
6° 11.3'W
3:07
Port Erin
54° 5.1'N
4° 46.3'W
11:05
Portland
50° 35.6'N
2° 26.2'W
6:40
Portpatrick
54° 50.4'N
5° 7.2'W
11:27
Portrush
55° 12.3'N
6° 39.6'W
6:47
Portsmouth
50° 48.8'N
1° 6.1'W
11:16
Ringaskiddy
51° 49.9'N
8° 19.4'W
5:15
River Tees (Entrance)
54° 38.9'N
1° 8.9'W
3:18
Roa Island
54° 4.2'N
3° 10.4'W
11:20
Roaring Middle Light (Wash)
52° 58.6'N
0° 20.9'E
6:04
Rosslare Harbour
52° 15.4'N
6° 20.3'W
5:25
Rosyth
56° 1.3'N
3° 26.7'W
1:53
Scarborough
54° 16.9'N
0° 23.4'W
3:49
Sheerness
51° 26.8'N
0° 45.0'E
12:12
Shivering Sand
51° 29.9'N
1° 4.7'E
11:59
Shoreham
50° 49.7'N
0° 14.9'W
11:06
Skegness
53° 8.7'N
0° 20.9'E
5:47
Southampton
50° 53.7'N
1° 24.3'W
11:19
Southend
51° 31.7'N
0° 43.0'E
12:11
Spurn Point
53° 34.2'N
0° 6.4'E
5:12
St. Helier
49° 10.5'N
2° 7.0'W
6:18
St. Mary's
49° 55.0'N
6° 18.7'W
4:31
Stornoway
58° 12.3'N
6° 23.3'W
6:49
Sullom Voe
60° 27.6'N
1° 18.1'W
9:13
Swansea
51° 36.5'N
3° 55.7'W
5:57
Tabs Head (Rivers Witham/Welland)
52° 56.0'N
0° 5.0'E
6:13
Tarbert Island (River Shannon)
52° 35.2'N
9° 21.5'W
5:17
Tilbury
51° 27.3'N
0° 20.3'E
0:18
Tobermory
56° 37.3'N
6° 3.9'W
5:49
Torquay
50° 27.5'N
3° 31.7'W
5:51
Ullapool
57° 53.7'N
5° 9.4'W
6:55
Walton-on-the-Naze
51° 50.7'N
1° 16.5'E
11:25
West Lighthouse (River Nene)
52° 48.5'N
0° 12.6'E
6:17
West Stones (River Great Ouse)
52° 49.7'N
0° 21.5'E
6:19
Weymouth
50° 36.4'N
2° 27.0'W
6:36
Whitby
54° 29.6'N
0° 36.8'W
3:35
Wick
58° 26.5'N
3° 4.9'W
11:07
Withernsea
53° 43.6'N
0° 2.6'E
4:37
Workington
54° 39.2'N
3° 34.7'W
11:27