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Response from developer
The app is free to download and try, using 2019 data. However if you subscribe, it will display 2020 ( or current year ) data.
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In-App Purchases
Details
About
Access Portland's tidal stream atlas instantly, even offline. Understand tidal flow quickly and accurately for sailing, coastal navigation, and passage planning. Features real-time charts, automatic updates, and navigation tools.
✓Real-time tidal stream charts
✓Offline functionality
✓Automatic chart updates
✓Swipeable tidal hours
✓Interpolated Rate Calculator
✓Tidal Set Tool (IAP)
✓Course to Steer (IAP)
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What's New in iStreams Portland
3.10
July 23, 2026
Localisations and minor bug fixes
2
In-App Purchases
$2.99
Devonport Tides 2019
Devonport Tides 2019
User reviews
Developer apps
FAQ
How does iStreams Portland get tidal data?
iStreams Portland uses High Water at Devonport to align its tidal stream atlas to the current time. It automatically selects the nearest High Water and displays the corresponding tidal stream chart.
Can I use iStreams Portland without an internet connection?
Yes, iStreams Portland offers fully offline functionality for all charts and tools. You only need an internet connection for the forecast link.
What navigation tools are available in iStreams Portland?
iStreams Portland includes an Interpolated Rate Calculator for stream rates between neaps and springs. The Tidal Set Tool and Course to Steer (CTS) are available as in-app purchases for more precise measurements.
How often is iStreams Portland updated?
The app was last updated on May 31, 2026, with version 3.09. It automatically updates charts as time progresses to the next valid tidal period.
What devices is iStreams Portland compatible with?
iStreams Portland is available for both iPhone and iPad devices.
What is the age rating for iStreams Portland?
iStreams Portland has an age rating of 4+, making it suitable for a wide range of users.
Does iStreams Portland have ads?
No, iStreams Portland does not contain advertisements. It is free to download and use, with optional in-app purchases for advanced tools.
How do I navigate through tidal hours in iStreams Portland?
You can easily swipe forward and backward through tidal hours to view past or future data. The app also allows you to toggle between Local Time and UTC.
