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.
Lowestoft
52° 28.3'N
1° 45.1'E
8:57
Gorleston (Great Yarmouth)
52° 34.3'N
1° 44.3'E
8:17
Margate
51° 23.4'N
1° 22.8'E
11:47
Felixstowe
51° 57.5'N
1° 20.8'E
11:05
Dover
51° 7.6'N
1° 20.2'E
11:27
Cromer
52° 56.1'N
1° 17.7'E
6:30
Harwich
51° 56.8'N
1° 17.1'E
11:18
Walton-on-the-Naze
51° 50.7'N
1° 16.5'E
11:25
Mistley Quay (River Stour)
51° 56.7'N
1° 4.8'E
11:30
Shivering Sand
51° 29.9'N
1° 4.7'E
11:59
Dungeness
50° 54.8'N
0° 58.7'E
11:14
Sheerness
51° 26.8'N
0° 45.0'E
12:12
Southend
51° 31.7'N
0° 43.0'E
12:11
Inner Dowsing Light
53° 19.0'N
0° 35.0'E
5:35
Coryton
51° 30.7'N
0° 32.5'E
12:24
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
Roaring Middle Light (Wash)
52° 58.6'N
0° 20.9'E
6:04
Skegness
53° 8.7'N
0° 20.9'E
5:47
Tilbury
51° 27.3'N
0° 20.3'E
0:18
Gibraltar Point
53° 5.3'N
0° 20.0'E
5:54
Boygrift
53° 17.7'N
0° 19.2'E
5:38
West Lighthouse (River Nene)
52° 48.5'N
0° 12.6'E
6:17
Spurn Point
53° 34.2'N
0° 6.4'E
5:12
Tabs Head (Rivers Witham/Welland)
52° 56.0'N
0° 5.0'E
6:13
Bull Sand Fort
53° 33.7'N
0° 4.1'E
5:16
North Woolwich
51° 29.9'N
0° 3.6'E
0:44
Newhaven
50° 46.9'N
0° 3.5'E
11:05
Withernsea
53° 43.6'N
0° 2.6'E
4:37
London Bridge
51° 30.5'N
0° 5.3'W
1:10
Immingham
53° 37.9'N
0° 11.2'W
5:35
Shoreham
50° 49.7'N
0° 14.9'W
11:06
Hull
53° 44.3'N
0° 19.9'W
5:59
Scarborough
54° 16.9'N
0° 23.4'W
3:49
Littlehampton
50° 47.9'N
0° 32.5'W
11:08
Whitby
54° 29.6'N
0° 36.8'W
3:35
Blacktoft
53° 42.4'N
0° 43.5'W
6:58
Portsmouth
50° 48.8'N
1° 6.1'W
11:16
Lerwick
60° 9.3'N
1° 8.4'W
10:45
River Tees (Entrance)
54° 38.9'N
1° 8.9'W
3:18
Cowes (Isle of Wight)
50° 46.1'N
1° 17.9'W
11:21
Sullom Voe
60° 27.6'N
1° 18.1'W
9:13
Southampton
50° 53.7'N
1° 24.3'W
11:19
North Shields (River Tyne)
55° 0.6'N
1° 25.8'W
3:04
Lymington (Entrance)
50° 45.2'N
1° 31.4'W
11:02
Christchurch (Quay)
50° 43.8'N
1° 46.8'W
10:37
Bournemouth
50° 42.9'N
1° 52.5'W
9:24
Aberdeen
57° 8.7'N
2° 3.6'W
0:50
St. Helier
49° 10.5'N
2° 7.0'W
6:18
Portland
50° 35.6'N
2° 26.2'W
6:40
Weymouth
50° 36.4'N
2° 27.0'W
6:36
Avonmouth
51° 30.4'N
2° 43.2'W
6:57
Heysham
54° 2.0'N
2° 55.5'W
11:14
Eastham
53° 19.5'N
2° 57.0'W
11:22
Newport
51° 32.7'N
2° 59.2'W
6:44
Liverpool (Princes Pier)
53° 24.4'N
3° 0.0'W
11:09
Fleetwood
53° 55.1'N
3° 0.5'W
11:15
Birkenhead (Alfred Lock)
53° 24.3'N
3° 0.9'W
11:09
Liverpool (Gladstone Lock)
53° 27.0'N
3° 1.1'W
11:04
Wick
58° 26.5'N
3° 4.9'W
11:07
Hinkley Point
51° 13.0'N
3° 7.4'W
6:19
Roa Island
54° 4.2'N
3° 10.4'W
11:20
Leith
55° 59.4'N
3° 11.0'W
1:54
Halfway Shoal
54° 1.4'N
3° 11.9'W
11:11
Barrow (Ramsden Dock Entrance)
54° 5.6'N
3° 13.5'W
11:24
Hilbre Island
53° 23.1'N
3° 13.8'W
10:57
Rosyth
56° 1.3'N
3° 26.7'W
1:53
Minehead
51° 12.9'N
3° 28.3'W
6:11
Torquay
50° 27.5'N
3° 31.7'W
5:51
Workington
54° 39.2'N
3° 34.7'W
11:27
Llandudno
53° 19.9'N
3° 49.5'W
10:41
Swansea
51° 36.5'N
3° 55.7'W
5:57
Mumbles
51° 34.2'N
3° 58.4'W
5:57
Moray Firth
57° 36.0'N
4° 0.4'W
11:37
Cromarty Firth
57° 41.1'N
4° 2.1'W
11:33
Barmouth
52° 43.1'N
4° 2.9'W
8:14
Aberystwyth
52° 24.4'N
4° 5.5'W
7:55
Ilfracombe
51° 12.6'N
4° 6.6'W
5:36
Plymouth (Devonport)
50° 22.9'N
4° 10.8'W
5:19
Douglas
54° 8.9'N
4° 28.0'W
11:16
Holyhead
53° 19.4'N
4° 37.6'W
10:04
Greenock
55° 56.9'N
4° 44.6'W
11:55
Port Erin
54° 5.1'N
4° 46.3'W
11:05
Millport
55° 45.1'N
4° 55.8'W
11:49
Fishguard
52° 0.2'N
4° 58.6'W
7:09
Kinlochbervie
58° 27.3'N
5° 2.8'W
7:10
Milford Haven
51° 42.2'N
5° 3.2'W
5:58
Falmouth
50° 9.4'N
5° 4.2'W
5:02
Newquay
50° 25.1'N
5° 5.2'W
4:53
Portpatrick
54° 50.4'N
5° 7.2'W
11:27
Ullapool
57° 53.7'N
5° 9.4'W
6:55
Oban
56° 24.8'N
5° 28.6'W
5:38
Newlyn
50° 6.1'N
5° 32.9'W
4:36
Bangor (Down, Northern Ireland)
54° 40.0'N
5° 40.3'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
Tobermory
56° 37.3'N
6° 3.9'W
5:49
Port Ellen (Islay)
55° 37.6'N
6° 11.3'W
3:07
Dublin (North Wall)
53° 20.8'N
6° 13.5'W
11:16
St. Mary's
49° 55.0'N
6° 18.7'W
4:31
Rosslare Harbour
52° 15.4'N
6° 20.3'W
5:25
Stornoway
58° 12.3'N
6° 23.3'W
6:49
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
Barrow Bridge
52° 16.8'N
7° 0.2'W
5:25
Londonderry
54° 59.5'N
7° 19.0'W
8:10
Malin Head
55° 19.8'N
7° 22.4'W
6:07
Cobh
51° 51.0'N
8° 17.8'W
5:09
Ringaskiddy
51° 49.9'N
8° 19.4'W
5:15
Cork (City)
51° 54.0'N
8° 27.3'W
4:15
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