A chip log is a %20%20%20%20This%20article%20concerns%20navigation%20in%20the%20sense%20of%20determination%20of%20position%20and%20direction%20on%20the%20surface%20of%20the%20Earth.%20... navigational tool used by %20%20Mariner%20can%20refer%20to%20%20The%20PBM%20Mariner%20flying%20boat%20The%20Mariner%20Space%20Program%20An%20archaic%20term%20for%20sailor%20%20This%20is%20a%20disambiguation%20page%20%26%238212%3B%20a%20navigational%20aid%20which%20lists%20other%20pages%20that%20might%20otherwise%20share%20the%20same%20title.%20... mariners to determine %20%20%20%20For%20alternate%20uses%2C%20see%20Speed%20(disambiguation).%20%20... speed through the water. A chip log consists of a piece of %20%20%20%20This%20article%20describes%20the%20wood%20that%20comprises%20trees%20and%20boards.%20... wood, most often cut in the shape of a quarter %20%20%20%20See%20The%20Circle%20for%20the%20distributed%20file%20storage%20system%2C%20and%20see%20Ring%20(diacritic)%20for%20the%20diacritic%20mark.%20%20%20... circle, or "quadrangle", and a length of %20%20%20Rope%20is%20also%20the%20title%20of%20a%20movie%20by%20Alfred%20Hitchcock%20%20%20%20%20%20Coils%20of%20rope%20used%20for%20long-line%20fishing%20%20%20A%20rope%20is%20a%20length%20of%20fibers%2C%20twisted%20or%20braided%20together%20to%20improve%20strength%2C%20for%20pulling%20and%20connecting.%20... rope or line with %20%20%20%20%20%20%20%20Some%20knots%3A%201.... knots tied every 51 %20%20This%20article%20is%20about%20a%20foot%20as%20a%20unit%20of%20length.%20... feet or so. To determine a %20%20%20A%20ship%20is%20a%20large%2C%20usually%20decked%20%20%20watercraft.%20... ship's speed, the chip log would be placed into the water %20%20The%20American%20Federation%20of%20Teachers%20(AFT)%20is%20the%20smaller%20of%20the%20two%20education%20labor%20unions%20in%20the%20United%20States%2C%20representing%201.... aft of the ship, line paid out, and the number of knots paid out in 30 %20%20%20%20This%20article%20is%20about%20the%20unit%20of%20time.%20... seconds counted. A number of considerations had to be taken into account -- the amount of following sea, stretch of the line, and inaccuracies in the measurement of 30 elapsed seconds. Time passage was most often marked with a "30 second glass", which would often run fast or slow based on ambient %20%20%20Temperature%20is%20the%20physical%20property%20of%20a%20system%20which%20underlies%20the%20common%20notions%20of%20%5Chot%5C%20and%20%5Ccold%5C%3B%20the%20material%20with%20the%20higher%20temperature%20is%20said%20to%20be%20hotter.%20%20%20... temperature, %20%20%20Humidity%20is%20the%20quantity%20of%20moisture%20in%20the%20air.%20... humidity, and %20%20%20Sea%20state%20refers%20to%20the%20height%2C%20period%2C%20and%20character%20of%20waves%20on%20the%20surface%20of%20a%20large%20body%20of%20water.%20... sea state.