pete340
Contributor
jbd:Out of curiosity--what is the signifigance of the 5 ft intervals?
While I have not seen every table ever made, the ones I have seen are all in 10 ft increments, which leads me to think that statistically there is no need to break the depths down in anything smaller than 10 feet increments.
One reason the tables use 10 foot intervals is that 5 foot intervals would make the tables too big. With 5 foot intervals you get more accurate results because you don't round off as much. This occasionally gives you slightly longer bottom times, which may or may not be important to you.