Perpendicular method
Time in secs to go from current radial to another radial at 90deg to current radial / degrees between the radials
Let’s say you are heading 060 towards a VOR. Do a 90 degree turn and head to radial 070. Time how long it takes to center on radial 070. Divide that by 10 degrees. That’s the time to the VOR
Isoceles method
Let’s say you are heading 060 towards the VOR. Turn 10 degrees right to head towards 070 radial. When you are centered on 070, note the time. That’s how how long it will take you to reach the VOR if you NOW fly the 070 radial
