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