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.
Workington
54° 39.2'N
3° 34.7'W
11:27
Withernsea
53° 43.6'N
0° 2.6'E
4:37
Wick
58° 26.5'N
3° 4.9'W
11:07
Whitby
54° 29.6'N
0° 36.8'W
3:35
Weymouth
50° 36.4'N
2° 27.0'W
6:36
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
Walton-on-the-Naze
51° 50.7'N
1° 16.5'E
11:25
Ullapool
57° 53.7'N
5° 9.4'W
6:55
Torquay
50° 27.5'N
3° 31.7'W
5:51
Tobermory
56° 37.3'N
6° 3.9'W
5:49
Tilbury
51° 27.3'N
0° 20.3'E
0:18
Tarbert Island (River Shannon)
52° 35.2'N
9° 21.5'W
5:17
Tabs Head (Rivers Witham/Welland)
52° 56.0'N
0° 5.0'E
6:13
Swansea
51° 36.5'N
3° 55.7'W
5:57
Sullom Voe
60° 27.6'N
1° 18.1'W
9:13
Stornoway
58° 12.3'N
6° 23.3'W
6:49
St. Mary's
49° 55.0'N
6° 18.7'W
4:31
St. Helier
49° 10.5'N
2° 7.0'W
6:18
Spurn Point
53° 34.2'N
0° 6.4'E
5:12
Southend
51° 31.7'N
0° 43.0'E
12:11
Southampton
50° 53.7'N
1° 24.3'W
11:19
Skegness
53° 8.7'N
0° 20.9'E
5:47
Shoreham
50° 49.7'N
0° 14.9'W
11:06
Shivering Sand
51° 29.9'N
1° 4.7'E
11:59
Sheerness
51° 26.8'N
0° 45.0'E
12:12
Scarborough
54° 16.9'N
0° 23.4'W
3:49
Rosyth
56° 1.3'N
3° 26.7'W
1:53
Rosslare Harbour
52° 15.4'N
6° 20.3'W
5:25
Roaring Middle Light (Wash)
52° 58.6'N
0° 20.9'E
6:04
Roa Island
54° 4.2'N
3° 10.4'W
11:20
River Tees (Entrance)
54° 38.9'N
1° 8.9'W
3:18
Ringaskiddy
51° 49.9'N
8° 19.4'W
5:15
Portsmouth
50° 48.8'N
1° 6.1'W
11:16
Portrush
55° 12.3'N
6° 39.6'W
6:47
Portpatrick
54° 50.4'N
5° 7.2'W
11:27
Portland
50° 35.6'N
2° 26.2'W
6:40
Port Erin
54° 5.1'N
4° 46.3'W
11:05
Port Ellen (Islay)
55° 37.6'N
6° 11.3'W
3:07
Plymouth (Devonport)
50° 22.9'N
4° 10.8'W
5:19
Oban
56° 24.8'N
5° 28.6'W
5:38
North Woolwich
51° 29.9'N
0° 3.6'E
0:44
North Shields (River Tyne)
55° 0.6'N
1° 25.8'W
3:04
Newquay
50° 25.1'N
5° 5.2'W
4:53
Newport
51° 32.7'N
2° 59.2'W
6:44
Newlyn
50° 6.1'N
5° 32.9'W
4:36
Newhaven
50° 46.9'N
0° 3.5'E
11:05
Mumbles
51° 34.2'N
3° 58.4'W
5:57
Moray Firth
57° 36.0'N
4° 0.4'W
11:37
Mistley Quay (River Stour)
51° 56.7'N
1° 4.8'E
11:30
Minehead
51° 12.9'N
3° 28.3'W
6:11
Millport
55° 45.1'N
4° 55.8'W
11:49
Milford Haven
51° 42.2'N
5° 3.2'W
5:58
Margate
51° 23.4'N
1° 22.8'E
11:47
Malin Head
55° 19.8'N
7° 22.4'W
6:07
Lymington (Entrance)
50° 45.2'N
1° 31.4'W
11:02
Lowestoft
52° 28.3'N
1° 45.1'E
8:57
Londonderry
54° 59.5'N
7° 19.0'W
8:10
London Bridge
51° 30.5'N
0° 5.3'W
1:10
Llandudno
53° 19.9'N
3° 49.5'W
10:41
Liverpool (Princes Pier)
53° 24.4'N
3° 0.0'W
11:09
Liverpool (Gladstone Lock)
53° 27.0'N
3° 1.1'W
11:04
Littlehampton
50° 47.9'N
0° 32.5'W
11:08
Lerwick
60° 9.3'N
1° 8.4'W
10:45
Leith
55° 59.4'N
3° 11.0'W
1:54
Larne
54° 50.9'N
5° 47.8'W
10:55
Kinlochbervie
58° 27.3'N
5° 2.8'W
7:10
King's Lynn
52° 45.3'N
0° 23.4'E
6:34
Inner Dowsing Light
53° 19.0'N
0° 35.0'E
5:35
Immingham
53° 37.9'N
0° 11.2'W
5:35
Ilfracombe
51° 12.6'N
4° 6.6'W
5:36
Hunstanton
52° 56.4'N
0° 29.2'E
6:11
Hull
53° 44.3'N
0° 19.9'W
5:59
Holyhead
53° 19.4'N
4° 37.6'W
10:04
Hinkley Point
51° 13.0'N
3° 7.4'W
6:19
Hilbre Island
53° 23.1'N
3° 13.8'W
10:57
Heysham
54° 2.0'N
2° 55.5'W
11:14
Harwich
51° 56.8'N
1° 17.1'E
11:18
Halfway Shoal
54° 1.4'N
3° 11.9'W
11:11
Greenock
55° 56.9'N
4° 44.6'W
11:55
Gorleston (Great Yarmouth)
52° 34.3'N
1° 44.3'E
8:17
Gibraltar Point
53° 5.3'N
0° 20.0'E
5:54
Galway
53° 16.1'N
9° 2.9'W
4:50
Fleetwood
53° 55.1'N
3° 0.5'W
11:15
Fishguard
52° 0.2'N
4° 58.6'W
7:09
Felixstowe
51° 57.5'N
1° 20.8'E
11:05
Falmouth
50° 9.4'N
5° 4.2'W
5:02
Eastham
53° 19.5'N
2° 57.0'W
11:22
Dungeness
50° 54.8'N
0° 58.7'E
11:14
Dublin (North Wall)
53° 20.8'N
6° 13.5'W
11:16
Dover
51° 7.6'N
1° 20.2'E
11:27
Douglas
54° 8.9'N
4° 28.0'W
11:16
Cromer
52° 56.1'N
1° 17.7'E
6:30
Cromarty Firth
57° 41.1'N
4° 2.1'W
11:33
Cowes (Isle of Wight)
50° 46.1'N
1° 17.9'W
11:21
Coryton
51° 30.7'N
0° 32.5'E
12:24
Cork (City)
51° 54.0'N
8° 27.3'W
4:15
Coleraine (River Bann Entrance)
55° 10.2'N
6° 46.4'W
6:50
Cobh
51° 51.0'N
8° 17.8'W
5:09
Christchurch (Quay)
50° 43.8'N
1° 46.8'W
10:37
Bull Sand Fort
53° 33.7'N
0° 4.1'E
5:16
Boygrift
53° 17.7'N
0° 19.2'E
5:38
Bournemouth
50° 42.9'N
1° 52.5'W
9:24
Blacktoft
53° 42.4'N
0° 43.5'W
6:58
Birkenhead (Alfred Lock)
53° 24.3'N
3° 0.9'W
11:09
Belfast
54° 36.1'N
5° 55.2'W
10:54
Barrow Bridge
52° 16.8'N
7° 0.2'W
5:25
Barrow (Ramsden Dock Entrance)
54° 5.6'N
3° 13.5'W
11:24
Barmouth
52° 43.1'N
4° 2.9'W
8:14
Bangor (Down, Northern Ireland)
54° 40.0'N
5° 40.3'W
10:57
Avonmouth
51° 30.4'N
2° 43.2'W
6:57
Aberystwyth
52° 24.4'N
4° 5.5'W
7:55
Aberdeen
57° 8.7'N
2° 3.6'W
0:50