Quote:
|
Originally Posted by Reece
Hi Rockin Robbins...I always use the 3.10 minute rule & this works out well with metric, but not so easy with imperial, would have to multiply the answer (in yards) by 0.9144 to get meters, then just shift decimal place to get speed in knots. Fincuan. 
Cheers. |
Bit of a wide opening here for a bit of shameless promotion of the SUPERIOR imperial measurements. Unlike the kilometer, which means absolutely nothing aside from the famous shrinking official meter bar, the nautical mile actually MEANS SOMETHING IMPORTANT! I know it's a shock. You may sit if you need to.:rotfl:
A nautical mile is one minute of arc, 1/60 of a degree in latitude, or in longitude at the equator. But let's get to your .9144 stuff. No such nonsense is necessary and you can do everything in your head even quicker than a calculator. Ready?
A knot is the speed of one nautical mile per hour or sixty minutes (time). If you measure the nautical miles traveled in six minutes (1/10 of an hour) and slide the decimal (comma or point, choose the choice of your choice) one place right, you have the speed in knots. The distance in three minutes (1/20 of an hour) times 20 equals your speed in knots. You can surely do that quicker than the .9144 gymnastics with 3:10.
BUT patch 1.4 has thrown us a bit of a curve. Under 5 miles, our measurement tools give us yards, not nautical miles. What to do? Since the nautical mile is only 24 feet greater than 2000 yards, and some of us can spit that far, we can use 2000 yards as the equivalent of 1 nautical mile. So if you have traveled 1500 yards over 3 minutes, that's 1500/2000 of a mile or .75 miles. Just divide the 15 by 2, slide your decimal indicator of choice one place left and that's how far you've gone in nautical miles. But that's not what you're after! You want knots. The answer is already there. Just knock off two zeros and read your speed as 15 knots. Let's recap:
NEW 3 MINUTE RULE FOR PATCH 1.4
Take the number of yards traveled in three minutes, slide the decimal whatsit left two places and read your speed. Man that was tough! Break out the torpedo juice!