iStreams Orkney Islands3.10 - App Store

iStreams gives you instant access to the Orkney Islands tidal stream atlas, aligned to the current time using High Water at Dover - even when you're offline.

Whether you're sailing, navigating coastal waters, or passage planning, iStreams helps you understand tidal flow quickly and accurately.

Key Features:
Real-time tidal stream charts
Automatically displays the correct hourly chart based on the nearest Dover High Water time.
Fully offline functionality (forecast link requires a connection)
No signal? No problem. All charts and tools work without internet access.
Automatic chart updates
As time progresses, the app switches to the next valid tidal period.
Swipe forward and backward through tidal hours with ease.
Pinch to zoom and drag to explore details.
Toggle between Local Time and UTC.
Show boat position on the chart

Navigation Tools:
Interpolated Rate Calculator
* Instantly calculate stream rate between neaps and springs.
Tidal Set Tool (In-App Purchase)
* Measure the true direction of tidal stream arrows with precision.
Course to Steer (CTS) (In-App Purchase)
* Calculate the correct heading to maintain your intended course.

How It Works:
iStreams automatically selects the nearest High Water at Dover and displays the corresponding tidal stream chart.

Want to plan ahead or review earlier conditions? Simply swipe forward or backward through the tidal hours to view past or future data.

Why Choose iStreams?
Designed for sailors, navigators, and coastal users
Fast, clear, and easy-to-use interface
Accurate tidal data when you need it most

Version History Localisations and minor bug fixes 3.10 Aug 5 Chart data card now draggable to preferred position
Fix for malformed text when user has set large font for device 3.09 May 31 Improved performance
Updated user interface
bug fixes 3.07 May 27 Improved performance
Updated user interface 3.06 May 25 Updated for iOS 26 2.93 12/02/2025 Updates and minor bug fixes 2.92 07/03/2025 Updates and minor bug fixes 2.91 08/27/2024 Updated licence information 2.9 04/02/2024 Updated for iOS17 2.8 11/04/2023 minor UI improvements 2.7 04/09/2023 Added a direct link to Inshore waters and strong winds forecast
Minor bug fixes 2.6 01/19/2023 Updated for iOS16 2.5 12/13/2022 Improved chart display when in Dark mode
Fixed a bug where the App would sometimes crash on launch, if not set to 24hr clock
Updated code to handle DateTime format changes in iOS 15.4 2.4 04/22/2022 Added facility to set Light / Dark Mode manually or automatically 2.3 03/28/2022 If subscribed, tide data for 2022 will be accessible from 1st Jan 2022 2.2 12/08/2021 Update to iOS15 2.1 09/29/2021 minor bug fix 2.0 03/11/2021 UI fix for iPad, where chart selector control was displaced 1.64 12/10/2020 App now updated for iOS14
App updated with 2021 tidal data ( available to access from 01/01/2021, if subscribed ) 1.63 12/02/2020 A slider control to adjust scale of units, is added to the 'Course to Steer' tool 1.62 10/20/2020 We have made a colour code correction to the 'Course to Steer' data panel 1.61 09/30/2020 Added in-app purchase 'Course to Steer' tool
The tidal hour floating inset is now moveable to any desired position
All subscription and purchase entitlements will now be available across all devices, providing the user is signed into iCloud
Updated user interface 1.6 09/05/2020 Fix for a bug that in some situations affected renewing a previous subscription 1.5 06/01/2020 Bug fix: in some occasional situations the date did not advance/retreat correctly when swiping to the next or previous tidal hour 1.4 03/07/2020 Updated for iOS13 and dark mode
Fix for crash when using 2020 tides 1.3 01/05/2020