knots/mph conversion tables

Yeah, the whole statute mile, nautical mile, kilometer thing is a PITA. Likewise the US gallon, or Imperial gallon, or liter of fuel. So is the degree-minute-second vs degree-minute-decimal business. And don't get us started again on the magnetic vs true north. I think there will be peace in the Middle East before everyone agrees on how to say where we are, where we're going, and how much fuel we'll need.

I will print this chart and keep it with the other conversion tables and the ancient Texas Instruments solar powered pocket calculator I keep handy at the helm.

I found the socks work great as long as I never turn around to see what's off the stern.
 
thanks for the chart Marty. i would 2nd everything Noro Lim said. being an inland boating rookie i could use some of those red/green socks with a large P & S printed on them. thanks again for generously fixing us up with that camperback, it has made our c-dory camping very enjoyable! Dan & Irene
 
Easy way to think of it is that a nautical mile is roughly 6000 ft vs 5200 for a statute mile. So the time it takes you to travel just under one and a quarter miles is your speed in knots. Very rough and not good for navigating but will get you in the ballpark.
 
I guess I'm not understanding the need for a table. First, I can multiply by 1.15 to convert nm or knots to miles or mph. Second, I'll get there when I get there. E.g. when the little triangle on the GPS that represents my boat, gets to the place on the map I want to be, I'm there. :)

Whether kts or mhp, I don't really need to know the distance or time to destination any better than +/- 15% anyway. I'm on a boat and I'm having fun.
 
rogerbum":2aqy5633 said:
I guess I'm not understanding the need for a table. First, I can multiply by 1.15 to convert nm or knots to miles or mph. Second, I'll get there when I get there. E.g. when the little triangle on the GPS that represents my boat, gets to the place on the map I want to be, I'm there. :)

Whether kts or mhp, I don't really need to know the distance or time to destination any better than +/- 15% anyway. I'm on a boat and I'm having fun.
Click to expand...
But of course, you are, after all, the second most interesting man in the world... :wink:
 
dotnmarty":u41b451e said:
rogerbum":u41b451e said:
I guess I'm not understanding the need for a table. First, I can multiply by 1.15 to convert nm or knots to miles or mph. Second, I'll get there when I get there. E.g. when the little triangle on the GPS that represents my boat, gets to the place on the map I want to be, I'm there. :)

Whether kts or mhp, I don't really need to know the distance or time to destination any better than +/- 15% anyway. I'm on a boat and I'm having fun.
Click to expand...
But of course, you are, after all, the second most interesting man in the world... :wink:
Click to expand...

LOL :smilep Good one Marty!

Actually I cheat. I have two GPS and I have one set to MPH and the other to Knots. Works for me.

Peter
 
BTW - it's pretty easy to multiply by 1.15 in your head. Take the speed in knots, divide by 10. Divide that result by two. Add those two things to the speed in kts to get the speed in MHP -
e.g.
10kts - divided by 10 = 1. 1 divided by 2 = 0.5. 10 + 1 +0.5 = 11.5 MPH.
or
22 kts = 22 + 2.2 + 1.1 = 25.3MHP
easy and no table needed. After talking math, I suppose I'm no longer even the 2nd most interesting person in the world.
 
Roger, could you do it for 33 knots :wink: then I will know how fast the Victoria Clipper that is coming at me is really going :lol:

Marty, Thanks for the table. Think I will print it off and put it beside the other GPS, which, Thanks to Peter's idea, will now be set in miles, so I can be more confused than ever :mrgreen: :oops:

I kind of like Rogers plan ... I'm on the water and I will get there when I do, and I will enjoy the process.

Harvey
SleepyC :moon
 
This is all well and good unless one cruises in Canadian waters where they talk of wind speeds in terms of kilometers/hour and knots.
Al
 
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