About RelVel Calculator
Solutions to your Relative Velocity problems at sea
The various complex situations at sea can be broken down into simple relative velocity problems. These situations could be collision avoidance, fleet maneuvering requirements, simple & complex flight operations, closing on to a faster ship, effect of wind/tide on the course made good, etc.
• Calculation of Course & Speed from Relative Motion
• Closest Point of Approach
• Opening / Closing on a Steady Bearing
• Changing Station on a Moving Ship
• Calculation of True Wind and Flying Course
What's new in the latest 1.2
Last updated on Oct 12, 2023
Minor bug fixes and improvements. Install or update to the newest version to check it out!

Super Fast and Safe Downloading via APKPure App
One-click to install XAPK/APK files on Android!