iStreams displays the valid hourly Solent tidal stream atlas for the current real time, in reference to the time of high water at Portsmouth... a smart app, fully functional offline. With tools to measure tide set and interpolated rate.

The nearest Portsmouth HW time to the actual time is selected from the database and the relevant streams chart is displayed, together with the time period for which the chart is valid.
As the time moves to the next valid period, the relevant hourly chart is auto displayed.
Local or UTC time can be selected

* Swiping on the chart, displays the next or previous tidal hour chart.
* Whenever the chart displayed is valid at the current time, the validity period is displayed in green.
* Pinching the screen zooms the chart
* Tapping the location button shows your actual boat position on the chart.

Select 'West' or 'East' from the segmented control to display Solent area required.

Select the 'Set' tool to measure the precise true course of any tidal stream arrow. (in-app purchase)

Select the rate tool to auto calculate the interpolated tidal rate when in between neaps and springs.

The app automatically selects the nearest Portsmouth HW time of the day, but if you want to see data for the next or previous HW of the day, swipe forward or back to advance the tidal hour.
For forward planning, tap on the date to select a different date, whereupon data relevant to that date will be displayed.

What’s New

Version 1.4

Bug fixes

Ratings and Reviews

2.6 out of 5
5 Ratings

5 Ratings

Boat guy47643 ,

Old 2018 data beware

Don’t rely on this as it is inaccurate and shows todays date and time perfectly but for 2018 and with 2018 data. So misleads you into the wrong information

Developer Response ,

The app is free to download and try, using 2018 data. However if you subscribe, it will display 2019 ( or current year ) data.

Vasco da Gama ,

Really useful, but you need to subscribe

Forget the one-star idiot, if you don’t subscribe you don’t have new data, once you subscribe it’s great.

indigoshoo ,

Top app. Very useful.

Saves a lot of time working out tidal hours.


Colin Porteous
33.4 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Rated 4+
© 2019 Navtech Software
In-App Purchases
  1. 1 Year Subscription £3.99
  2. Unlock 'Set' tool £1.99
  3. 6 Month Subscription £2.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

More By This Developer

You May Also Like