- stake, pole, perch, post: an elongated wood or
metal pole, embedded in the bottom to serve as a navigational aid or a support for a
navigational aid. (adapted from IHO Dictionary S-32, 5th Edition, 4960)
- withy : a tree without roots stuck or spoiled
into the bottom of the sea to serve as a navigational aid.
- beacon tower: a solid structure of the order of
10 metres in height used as a navigational aid.
- lattice beacon: a structure consisting of
strips of metal or wood crossed or interlaced to form a structure to serve as an aid to
navigation or as a support for an aid to navigation.
- pile beacon: a long heavy timber(s) or
section(s) of steel, wood, concrete, etc., forced into the seabed to serve as an aid to
navigation or as a support for an aid to navigation.(Adapted from IHO Dictionary, S-32,
5th Edition, 3840 and Navigation Dictionary, US National Oceanic and Atmospheric
Administration - NOAA, 1969)
- cairn: a mound of stones, usually conical or
pyramidal, raised specifically for maritime navigation. (adapted from IHO Dictionary,
S-32, 5th Edition, 601).
- buoyant beacon: a tall spar- like beacon fitted
with a permanently submerged buoyancy chamber, the lower end of the body is secured to
seabed sinker either by a flexible joint or by a cable under tension. (IHO Specifications,