. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Reprinted from GO MAGAZINE, GUIDE TO THE WATERWAYS. TIDE TALK By Bernard D. Zetler Atlantic Oceanographic Laboratories, Miami. GO OCTOBER I968 The Editor has invited me to write a column, hopefully monthly, combining a training of many years in tides with an abysmal lack of knowledge of local waters, of boat- ing in general and of fishing. He has also informed me that I will not be premitted to hide behind horrendous mathematical formulas. I'm willi
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Reprinted from GO MAGAZINE, GUIDE TO THE WATERWAYS. TIDE TALK By Bernard D. Zetler Atlantic Oceanographic Laboratories, Miami. GO OCTOBER I968 The Editor has invited me to write a column, hopefully monthly, combining a training of many years in tides with an abysmal lack of knowledge of local waters, of boat- ing in general and of fishing. He has also informed me that I will not be premitted to hide behind horrendous mathematical formulas. I'm willing to try! Although the ESSA Atlantic Oceanographic Laboratories arrived only recently in Miami, we receive a remarkably large number of phone inquiries requesting tide information for nearby waters. Although I try to oblige to the best of my ability, I am haunted by the thought that most of the callers don't want tide information and that what they really want is tidal current infor- mation. For example, in navigating small craft, the problem of current- induced drift is frequently more significant than the available depth of water at a given time. The question then is whether the caller knows enough of the local relationship between tide and tidal current to properly use the tide information. The relationship is not constant but varies from place to place. The time of slack water does not generally coincide with the time of high or low water nor does the time of maximum current usu- ally coincide with the time of most rapid change in the vertical height of the tide. At stations located on a tidal river or bay, the time of slack water may differ from one to three hours from the time of high or low water. It is for this reason that the Coast and Geodetic Survey pub- lishes tidal current tables as well as tide tables. GO NOVEMBER I968 A number of years ago, we were informed that on occasion the pilots were having a hard time bringing large aircraft carriers into the Brookly
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