anyTide UK is a mobile tide and current prediction app created by the National Oceanography Centre (NOC), funded by the Natural Environment Research Council (NERC).
anyTide UK tides provides tidal predictions around the North Western European Shelf, with particular focus on the British Isles.
The app is available in the Apple app store and an Android version -
The anyTide app is not to be used for navigation purposes.
There are two types of tidal predictions in the app:
- Predictions based on data from tide gauges located at sites around the British Isles
- Predictions based on computer models developed at NOC, Liverpool. This models the coastline as 1.8km grids and allows tidal predictions at any grid point around the coastline (and in major estuaries).
The models based on a 1.8km grid are a novel feature of the app and allow users to obtain tide predictions in a much wider range of locations (e.g. in areas away from ports with tide gauges) and "fill in the gaps" between observation points.
Predictions based on Known Ports/Observation Points
These locations are shown as purple pins on the map page.
Pinch the screen to zoom in on the port of interest, e.g. Liverpool (Gladstone Dock), and touch the pin to display the port name and tide button:
Now pressing the blue arrow on the button displays the tide prediction for the current day:
Placing your finger on the tide chart at any point displays cross-hairs which show the tide height and time at that particular point. Moving your finger across the chart scrolls the cross-hairs and shows the progressive tide level and time.
Pinch the chart to zoom in/out and swipe to change the dates displayed:
Pressing the blue "home" button when zoomed out or on a future date will return to today's tide prediction.
The tide charts for known ports are displayed in purple.
Predictions from User Chosen Map Coastal Locations
To obtain a prediction at a point not covered by port data, pinch to zoom in the map to the area of interest and touch the map at the point for which a tidal prediction is required. This displays a red pin. Touch the pin to display the "Show tides" button:
Pressing the blue arrow button to "show tides" will display today's tide for this location. Please note that the pin location chosen will jump to the nearest defined grid point before displaying the tide at this point (i.e. to the nearest 1.8km grid). The latitide and longitude for the exact location of the tide model is shown at the top of the chart screen, underneath the date.
Similar to the tide charts for known ports, the screen can be pinched to zoom out and in and swiped to move dates. The blue "Home" button will always return to the tidal prediction for the current date. Pressing and holding at a point on the chart will display the crosshairs with the tide height and time.
The tide charts for user-defined locations are shown in green.
If you place a pin on an area where no tidal model is available (e.g. far offshore or inland), the app will automatically jump to the nearest valid data point. This feature is also useful in large tidal river estuaries for finding the furthest upstream model available. e.g. placing a pin near Gloucester and asking for a tide, will jump the pin to the nearest valid grid point on the River Severn.
Current locations (e.g. frequently used locations) can be bookmarked for easier future reference.
From the tide chart of the required location, press the "Bookmarks" symbol at the bottom of the screen, which takes you to the Bookmarks screen. Press the "Add" button to bookmark the current location. By default the name will show the port name or the lat/long of the location. This can be changed to any suitable name.
Bookmarks can be edited or deleted by pressing the "manage" button in the bookmarks screen.
anyTide needs to have internet connection to create tide predictions (either via wi-fi or a cellular network). However, once a location is bookmarked, predictions for that location are available even when the device has no internet connection.
Time Displayed and Chart Scaling
Please note that the time is always displayed in GMT - the user must take account of this during BST or different time zones.
The tide height scale in metres can be altered using the anyTide section in the Settings function of your iOS device. The most useful setting is Auto, which scales the tide height axis according to the values displayed. However, the setting can be manually set to different values, ranging from 5 metres to 15 metres, which may be more effective for a particular location.
A Note About Chart Datum
Tide predictions in anyTide based on tide gauges (at defined ports) are by definition referenced to chart datum, since the chart datum is known for that fixed point. For the thousands of modelled 1.8km grids around the coastline, a calculation has been made by analysing the lowest tides over a historical period of 20 years. SInce chart datum is defined in the UK (e.g. by the UK Hydrographic Office) as the lowest possible astronomical tide (LAT), this will give a very close approximation to chart datum for each of the modelled points.
Free Predictions and In-App Purchases
For app support, contact firstname.lastname@example.org
anyTide was developed in conjunction with Winchester Innovation. For further information, see www.winchesterinnovation.co.uk
For further information about NOC's business development and commercialisation activities, email: email@example.com