Satellites make it possible to download grib files offshore but the data transfer is optimal only when they are positioned well and long enough above your vessel. iWatchSat tells you when a satellite is easily reachable with Iridium.
With an improved connection and signal quality, connection attempts and time to download are considerably reduced.
iWatchSat combines High Definition graphics and simplicity. It automatically identifies satellites you can potentially connect to and displays when to connect. Launch iWatchSat and tap on “Next” on the upper left of the screen to display when the next satellite is reachable. By tapping a second time on “Next”, the subsequent satellite passage time is displayed . Double tap on the Passage time on the upper middle of the screen to reset to the actual time. Passage prediction options are adjustable by taping the settings icon on the upper right. Time can be slid manually by enabling the “Clock” button on the lower right corner. To zoom in, zoom out and explore other regions for satellites, tap on the Planet button on the lower left corner.
This feature is well known by our Weather4D Pro users who recently upgraded to Weather4D Routing and Weather4D Routing & Navigation. We’re excited to make it available by popular demand as a free stand alone app for everyone.
Please note that rain impacts connection quality even when the satellite positioning is optimal.

What’s New

Version 1.2

- Bug fixes

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

App Privacy

The developer, APP4NAV, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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