Searay, my original post gives the definitions of lee shore, etc. from Chapman--you might want to take another look at it. Also, it is important to remember that speeds in knots are not statute (land) miles per hour, but nautical (sea) miles per hour. I find it best to deal with sea miles as being 15% bigger than land (statute) miles. So if I tell a non-nautical kayaker that I paddled 20 nautical miles, I can then do a quick mental calculation and tell them I paddled: 20 plus 10% of 20 (= 2 miles), plus 5% of 20 (= 1 mile), equals 20+2+1=23 statute miles. A statute mile is thus roughly 87% as long as a sea mile. NOAA charts always show distances in nautical (sea) miles. By the way, aviation also uses knots and nautical miles.