FIELD: instrument engineering.
SUBSTANCE: invention refers to hydrographic equipment and can be used for creation of water geodetic network. Demersal reference point consists of solid extended spike with stabiliser in a form of resonant tuning-fork tines. Note that reference point is performed with the possibility of location and its recognition at resonant frequency and bottom penetration from ice or ship.
EFFECT: development of simple demersal reference points that do not require power supply and that can be found, recognised and help to perform necessary measurements.
4 cl, 2 dwg
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