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