Converting RPM's to MPH

[Larry and Judy's Excape]

I do not have a speedometer on my boat by do have a tack. Is there a quick formula to convert RPM's to MPH. Or is there a gauge available for a Bennington that does both?

 

[Remediation]

No formula would exist. Too many variables. Get an app on your phone. Our speedometer has not worked for years and don't care. After a few times checking your speed you will have a good idea of what speed you are at by the RPM

 

[Toddk9]

you have a fish finder? Bennington's use the GPS on that. I have the little Striker 4 on my boat

 

[Alicedream]

Down load a gps app on your phone and it will tell you how fast your going.

 

[sunedog]

I downloaded an app simply called "Speedometer" from the app store. All it has is the speed in big white numerals on a black background. Dead simple. The only adjustment is choice of mph or km/h or knots. Nothing else for me to screw up when the sunlight is so bright you can't see what you've just inadvertently changed. Free with some barely noticeable ads at the bottom.

 

[mikeb33]

The speedometer apps are cool. They also tell your time out, distance traveled and top speed.