# iStreams Thames Estuary

> Offline tidal stream atlas for the Thames Estuary, aligned to current time. (iPhone/iPad app by Navtech Software.)

- Source: https://appshunter.io/ios/app/istreams-thames-estuary/id1455616218 (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 18.4 · 41 MB
- Languages: French (France), German (Germany), American English, Danish, Norwegian Bokmål, Dutch
- Released: 2019-03-11
- Data updated: 2026-08-13
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/istreams-thames-estuary/id1455616218/reviews.md

## What is iStreams Thames Estuary?

iStreams gives you instant access to the Thames Estuary tidal stream atlas, aligned to the current time using High Water at Sheerness — 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 Sheerness 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 Sheerness 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

## Key features

- Real-time tidal stream charts
- Automatic hourly chart display
- Fully offline functionality
- Automatic chart updates
- Swipe through tidal hours
- Pinch to zoom and drag
- Toggle Local Time/UTC
- Show boat position on chart

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 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 |
| Sheerness Tides 2019 | $2.99 | one-time |
| 6 Month Subscription | $2.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/istreams-thames-estuary/id1455616218/reviews.md

### 1/5 — iPad error

*2025-07-29*

Just paid for another year, and it no longer works.  Just opens and instantly closes.  Useless.

**Developer response:** Please update to the latest version on the App Store

### 1/5 — Does not work on iPad

*2019-08-09*

Does not work on iPads’ opens and instantly quits!

**Developer response:** Please download the latest version. The app works on both iPad and iPhone.

## Frequently asked questions about iStreams Thames Estuary

### What is iStreams Thames Estuary?

iStreams Thames Estuary provides real-time tidal stream charts for the Thames Estuary, functioning even when you are offline. It automatically displays the correct hourly chart based on the nearest High Water at Sheerness.

### Does iStreams Thames Estuary work offline?

Yes, all charts and navigation tools within iStreams Thames Estuary work without an internet connection, making it reliable for use in areas with no signal.

### How does iStreams Thames Estuary update charts?

The app automatically updates charts as time progresses, switching to the next valid tidal period. You can also easily swipe forward and backward through tidal hours to view past or future data.

### What navigation tools are available in iStreams Thames Estuary?

iStreams Thames Estuary offers an Interpolated Rate Calculator for stream rate, and optional in-app purchases for a Tidal Set Tool to measure stream direction and a Course to Steer (CTS) calculator.

### Is iStreams Thames Estuary suitable for beginners?

The app is designed with a fast, clear, and easy-to-use interface, making it accessible for sailors and navigators. Its automatic chart selection and offline functionality simplify understanding tidal flow.

### What devices support iStreams Thames Estuary?

iStreams Thames Estuary is available for both iPhone and iPad devices, indicated by its support for these platforms.

### How often is iStreams Thames Estuary updated?

The latest version of iStreams Thames Estuary is 3.09, which was last updated on May 31, 2026. This indicates a history of regular updates to the application.

### What is the age rating for iStreams Thames Estuary?

iStreams Thames Estuary has an age rating of 4+, meaning it is suitable for users of all ages and does not contain content inappropriate for children.

## Version history (last 5 releases)

### 3.10 — 2026-08-03

Localisations ana minor bug fixes

### 3.09 — 2026-05-31

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

### 3.07 — 2026-05-27

Improved performance
Updated user interface
bug fixes

### 3.06 — 2026-05-24

Improved performance
Updated user interface

### 3.04 — 2026-05-13

Improved performance
Updated user interface

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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)
- [iStreams Channel Islands](https://appshunter.io/ios/app/istreams-channel-islands/id1223503159)

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

## Related topics

[s249](https://appshunter.io/ios/topics/s249)

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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.*