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log

logarithm (common).

Related Terms

HARPOON LOG

A log which consists of a rotator and distance registering device combined in a single unit, which is towed through the water. The TAFFRAIL LOG is similar except that the registering device is located at the taffrail, with only the rotator in the water.

LOG

1. A record of courses or operation. 2. A device to measure speed.

STW

Speed through (the) water, speed of the vessel relative to the surrounding water (and as shown by a Log).

BEARING BOOK

A log for the recording of visual bearings

BELL BOOK

The log of ordered engine speeds and directions

LOG CHIP

The wooden quadrant forming part of a chip log. Also called LOG SHIP.

CURRENT LINE

A graduated line attached to a CURRENT POLE, used in measuring the velocity of the current. The line is marked so that the speed of the current, expressed in knots and tenths, is indicated directly by the length of line carried out by the current pole in a specified interval of time. When marked for a 60 second run, the principal divisions for the whole knots are spaced 101.33 feet and the subdivisions for tenths of knots are spaced at 10.13 feet. Also called LOG LINE.

ELECTROMAGNETIC LOG

A log containing an electromagnetic sensing element extended below the hull of the vessel, which produces a voltage directly proportional to speed through the water.

FORBES LOG

A log consisting of a small rotator in a tube projecting below the bottom of a vessel, and suitable registering devices.

STREAM

To place overboard and tow, as to stream a log or stream a sea anchor.
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