iStreams displays the valid hourly Channel Islands tidal stream atlas for the current UT time , in reference to the current UT time of high water at Dover... a smart app, fully functional offline.

The nearest Dover HW time (UT) from the actual time (UT) is selected from the database (if downloaded via in app purchase) 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.

* Swiping left or right on the chart, displays the next or previous tidal hour chart.
Whenever the chart displayed is valid at the current time (UT), 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 'Channel Islands' or zoomed 'Alderney' streams chart, from the segmented control.

Tap on the interpolation button to auto calculate the tidal rate when in between neaps and springs.
A scale shows whether it is neaps, springs or somewhere in between.

The app automatically selects the nearest Dover 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.

In Manual mode any Dover HW time derived from an almanac, can be manually set by tapping inside the HW time display box. In this mode ,the time display reverts to whatever time zone the iOS device is set, auto chart update is also implemented.

What's New

Version 1.5

Now fully functional, using historical tidal data, even if a database valid for the current year has not yet been purchased.


Colin Porteous
80.4 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad and iPod touch.
Age Rating
Rated 4+
© 2018 Navtech Software
In-App Purchases
  1. Dover Tides 2018 £2.99


  • Family Sharing

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

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