Sofar

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Sofar

</dt>
(From sound fixing and ranging). A system of navigation providing hyperbolic lines of position determined by shore listening stations which receive sound signals produced by depth charges dropped at sea and exploding in a sound channel which is at a considerable depth in most areas. </dd>
This system is used in Project Mercury for locating spacecraft down at sea. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use