iPhone Screenshots


A simple app that can aid in determining the required angle between two objects when the desired lateral separation and current distance between the two objects is known. This is useful in maritime operations such as stationing.

What’s New

Version 2.0

A totally new user interface that draws a triangular representation of what you're trying to measure. Radian Rule 2.0 offers a new feature as well: the ability to determine separation and distance based on angular separation. Version 2.0 also offers the ability to change distance units and supports dark mode.

Ratings and Reviews

5.0 out of 5
10 Ratings

10 Ratings

Winterberry16 ,


Great for people who hate public math on the bridge wing with the entire wardroom breathing over your shoulder!

n8blake ,

Easy to use!

Great app, easy to use!

drummdude716 ,

Game Changer

A useful tool for all SWOs before an UNREP!

App Privacy

The developer, Nate Blake, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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