Binoculars
"Binoculars" are usually hand held devices used to magnify objects in the distance and are essential in locating man overboard"s (MOB's).
binocular - A pair of small telescopes, one for each eye, used to magnify distant objects.
bitt - A sturdy post mounted on the bow or stern to which anchor or mooring lines may be attached.
binocular - A telescopic instrument, for the use of both eyes simultaneously, having two tubes - each furnished with lenses.
Binoculars:
An optical device for magnifying distant objects by means of lenses and prisms, consisting of two barrels, one for each eye.
Binoculars
Radar
VHF bridge-to-bridge radiotelephone
Automated radar plotting aids (sometimes called collision avoidance radar)
Differential GPS (DGPS) satellite navigation equipment
Automatic Identification Systems (AIS) radio transponders ...
In choosing a binocular marine glass, take care not to be persuaded into buying a trashy article.
The usual navigation tools: Charts, dividers, parallel rules, pencils, hand held compass, binoculars. All this is usually aboard every charter boat, but I am used to bring my own in my sail bag, because I know I can rely on my own equipment.
Navigation equipment can be simple. Charts, including a reasonable area around your intended route, tide table, dividers and parallel rule, sighting compass and, of course, the trusty GPS. A good pair of binoculars can help.
 See also: Hull, Boat, Point, Line, Sheet
  
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