Knowledge Base
fathom
Six feet.

fender
A cushion, placed between boats, or between a boat and a pier, to prevent damage.

fiber optic gyro
A high accuracy rate sensor that uses a laser and fiber optic ring to determine angular rate.

field
In the NMEA 0183 standard, a character or string of characters immediately preceded by a field delimiter (see Delimiters). In NMEA 2000® , fields of data that make up a PGN.

figure eight knot
A knot in the form of a figure eight, placed in the end of a line to prevent the line from passing through a grommet or a block.

fixed field
In the NMEA 0183 standard, a field in which the number of characters is fixed. For data fields, such fields are shown in the sentence definitions with no decimal point. Other fields that fall into this category are the address field and the checksum field.

flare
The outward curve of a vessel’s sides near the bow. A distress signal.

flood
An incoming current.

floorboards
The surface of the cockpit on which the crew stand.

fluke
The palm of an anchor.

following sea
An overtaking sea that comes from astern.

fore-and-aft
In a line parallel to the keel.

forepeak
A compartment in the bow of a small boat.

forward
Toward the bow of the boat.

fouled
Any piece of equipment that is jammed or entangled, or dirtied.

freeboard
The minimum vertical distance from the surface of the water to the gunwale.

frequency range
See "bandwidth".

 
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