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   Radius of Action
   Returning to Alternate Base
  Beyond your average e6b:
Visualize results of radius of actions calculations
Radius of Action Returning to Alternate Base
  This site now uses a Flash emulator called Ruffle. This is all done automatically on our server (no need to configure or install anything on your part). Note: Due to lack of keyboard and mouse pointer, MAY NOT BE USABLE WITH iPad or iPhone. Hasn't been tested on iPads with keyboard and mouse pad.  

 Tip: Press F11 if you need to toggle full-screen on/off to view this page better in your browser. F11 works in Microsoft Edge, Firefox and Opera.

This program calculates the distance (radius of action) and necessary headings and time to fly before having to return to an alternate base that is at a certain distance and bearing from the fixed base of departure given wind conditions and the fuel time available.

Note: Radius of Action Calculations are also known as Point of Safe Return Calculations (PSR).

Input data in the white colored fields in the desired unit column and press "Calculate". Results will then be displayed along with a visual representation. If inputs are invalid then no results or visual representations will be displayed.

For a random example click on "Test" and then "Calculate". You may click "Test" as many times as you wish to generate an infinite amount of examples.

To clear all fields press "Reset".

See also:
  Intercepting Moving Target  
  Radius of Action - Returning to the Same Base
  Radius of Action - Returning to Moving Base
  Radius of Action - Returning to Moving Alternate Base

















  Navigation Simulator  
  Practice in our simulator specifically designed for learning the basics of instrument navigation. Try the Navigation Simulator, available for Windows PC. Now completely free. There is also an online version that runs directly on this website, and can be viewed on a Windows PC, Mac, or Linux OS. Note: the Windows PC version of the simulator has its own self-contained Flash, so it works without Flash being installed and is not subject to the Adobe Flash discontnuation / end of life.  



  Free Online Simulators
No installation required. These simulators are ready to run on your web browser and have a rich set of features. Practice basic VOR, ADF, RMI and HSI intrument orientation and execute holding patterns. Other simulators include pitot static system and altimeter errors. Click here to go to main online simulator page.

Units and Abbreviations
Length or Distance
Nm -  nautical miles
km -  kilometers
sm -  statute miles
knots -  knots (Nm/h)
km/h -  kilometers per hour
sm/h -  statute miles per hour
h or hr(s) -  hour(s)
m or min(s) -  minute(s)
s or sec(s) -  second(s)
o degrees 


All rights reserved to Luiz Roberto Monteiro de Oliveira.  No content or code of this web site may be reproduced without prior permission from the author.