When planning trips around the Anglesey coast (the Sea Kayak Wales pilot area), tidal stream information is important, but difficult to estimate from tide times alone.
There are useful sources of tidal stream data such as tidal diamonds on nautical charts and notably that contained within “Cruising Anglesey and Adjoining Waters” by Ralph Morris.
Tidal stream data is usually presented with reference to High Water Dover (HWD), and the actual flow at any given time identified by calculating how long before or after HWD that time occurs.
Normally, tidal stream data will present separate values for Spring and Neap tides.
Sea Kayak Wales are proud to introduce our smart-phone and tablet app presenting tidal flow data around Anglesey (the pilot area for the Sea Kayak Wales service).
The app is now available for AndroidTM and iOSTM devices.
The iOS version can be downloaded from the iTunes Store
The Android version can be downloaded from the Google AppStore
and by pointing your Android device barcode reader at this QR Code
Operating The App
The user enters the time of High Water Dover and whether it is a Spring or Neap tide. If your device can connect to the Internet then the time of the closest HWD to the current time will be automatically set but can be simply changed for future dates.
There is also a [Tide Times] button that will link you to an internet site where tide predictions for any date can be obtained.
Tap the [Go] button and the app will display a map of Anglesey with markers at key tidal flow locations.
- Blue markers mean 'Slack Water'
- Green markers indicate up to 2 knots of tidal flow
- Yellow markers indicate 2 to 4 knots
- Red markers indicate more than 4 knots
(this is Anglesey, could be 8 knots)
- Arrows indicate the approximate direction of flow
- A Magenta marker indicates the device current GPS position
(assuming this can be displayed at the current map scale)
- Touch individual markers to see forecast flow rate
- Use gestures to manipulate the map - zoom, scroll, etc.
- Use the [+ hour] and [- hour] buttons to see the tidal flow rates that would apply to the relevant times of day
- Use [Now] to get the App to display the hour that is closest to the current time
(This only makes sense if you have entered the tide time for today)
If the App ‘knows’ where the user is (from the GPS) it can identify the nearest tidal information point and display information from that point having due regard for the direction in which the user is facing.
The camera on the device provides the image, and the orientation is calculated from its sensors.
You get to see tidal flow data for the water you are looking at.
This feature is currently only available on the Android version but is being tested on the iOS platform and will be available as an update from the iOS app store shortly.
The iOS version can be downloaded from the iTunes AppStore
The Android version can be downloaded from the Google AppStore here
or by pointing your Android device barcode reader at this QR Code