# iStreams Channel Islands — Live and future tidal streams

> Channel Islands tidal stream atlas with offline functionality and navigational tools. (iPhone/iPad app by Navtech Software.)

- Source: https://appshunter.io/ios/app/istreams-channel-islands/id1223503159 (this page in markdown: same URL + `.md`)
- Developer: [Navtech Software](https://appshunter.io/developer/355517263)
- Category: Navigation, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.2 · 56 MB
- Languages: French (France), German (Germany), American English, Danish, Norwegian Bokmål, Dutch
- Released: 2017-04-13
- Data updated: 2026-08-13
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/istreams-channel-islands/id1223503159/reviews.md

## What is iStreams Channel Islands?

iStreams gives you instant access to the Channel 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 streams

## Key features

- Hourly tidal stream atlas
- Offline functionality
- Tide set and rate measurement
- Course to Steer calculation
- Local and UTC time options
- Boat position display on chart
- Zoomable charts

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Dover Tides 2018 | $2.99 | one-time |
| Dover Tides 2019 | $2.99 | one-time |
| 6 Month Subscription | $2.99 | one-time |
| 1 Month Subscription | $2.99 | one-time |
| 1 Year Subscription | $5.99 | one-time |
| Unlock Set tool | $1.99 | one-time |
| Unlock CTS tool | $3.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/istreams-channel-islands/id1223503159/reviews.md

### 4/5 — Good App

*2023-09-11*

The app works well - I had a bit of problems getting the actual year on all on my devices (ie iphone and ipad) but the developer was very responsive and equally helpful in overcoming that issue. I would recommend istreams.

### 1/5 — Inaccurate 2018 data

*2019-05-17*

Old data don’t rely on this apps information

**Developer response:** The app is free to download and try, using 2019 data. However if you subscribe, it will display 2020 ( or current year ) data.

## Frequently asked questions about iStreams Channel Islands

### What is iStreams Channel Islands?

iStreams Channel Islands is a navigation app that displays hourly tidal stream data for the Channel Islands. It functions offline and includes tools for measuring tide set, rate, and calculating Course to Steer.

### Does iStreams Channel Islands have ads?

No, iStreams Channel Islands does not contain advertisements. It is a free app with optional in-app purchases for advanced features.

### What devices support iStreams Channel Islands?

iStreams Channel Islands is available for iPhone and iPad devices, supporting iOS.

### How often is iStreams Channel Islands updated?

The app was last updated on December 2, 2025, indicating regular updates to maintain functionality and data accuracy.

### What are the in-app purchases for iStreams Channel Islands?

The 'Set' tool to measure the precise true course of any tidal stream arrow and the 'CTS' tool to calculate a Course to Steer are available as in-app purchases.

### Can I use iStreams Channel Islands offline?

Yes, iStreams Channel Islands is fully functional offline, allowing you to access tidal stream data without an internet connection.

### What is the age rating for iStreams Channel Islands?

iStreams Channel Islands has an age rating of 4+, making it suitable for a wide range of users.

### How does iStreams Channel Islands determine tidal data?

The app uses the nearest Dover High Water time from its database to display relevant tidal stream charts for the selected time period.

## Version history (last 5 releases)

### 4.10 — 2026-07-25

Localisations and minor bug fixes

### 4.09 — 2026-05-31

Chart data card now draggable to preferred position
Fix for malformed text when user has set large font for device

### 4.07 — 2026-05-27

Improved performance
Updated user interface
bug fixes

### 4.06 — 2026-05-24

Improved performance
Updated user interface
Updated boat position functionality

### 3.6 — 2025-12-02

Updated for iOS 26

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## More apps by Navtech Software

- [E6b Pilot — Flight Computer](https://appshunter.io/ios/app/e6b-pilot-flight-computer/id368495864)
- [iPlotter Solent](https://appshunter.io/ios/app/iplotter-solent/id397677340)
- [Dutchman's Log](https://appshunter.io/ios/app/dutchmans-log/id474782184)
- [iHeatLoss](https://appshunter.io/ios/app/iheatloss/id680564773)
- [Easter Match Puzzle](https://appshunter.io/ios/app/easter-match-puzzle/id836681161)

All apps by Navtech Software: https://appshunter.io/developer/355517263

## Related topics

[istreams channel islands](https://appshunter.io/ios/topics/istreams-channel-islands) · [istreams english channel](https://appshunter.io/ios/topics/istreams-english-channel) · [channel islands](https://appshunter.io/ios/topics/channel-islands) · [istreams west scotland](https://appshunter.io/ios/topics/istreams-west-scotland) · [istreams solent](https://appshunter.io/ios/topics/istreams-solent) · [istreams north sea](https://appshunter.io/ios/topics/istreams-north-sea)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-13.*