| CPC G01C 13/002 (2013.01) [G01P 5/06 (2013.01); G01P 5/12 (2013.01); G01P 5/24 (2013.01); G01S 19/01 (2013.01)] | 20 Claims |

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1. Apparatus adapted to survey a predetermined characteristic within a body of fluid adjacent an axis that transects the body of fluid, the apparatus comprising:
a survey member interposed between first and second position defining arrangements; and
at least one instrumentality associated with the survey member, each instrumentality adapted to survey over a predetermined period of time, the predetermined characteristic of the body of fluid adjacent the axis,
wherein at least one of the position defining arrangements is selected from the group consisting of one or more of:
a. a buoyancy control device adapted to position that position defining arrangement at a predetermined depth within or on or adjacent a surface of the body of fluid or on or adjacent a floor of the body of fluid; and
b. an engagement mechanism adapted to engage a fixed or floating structure completely or partially submerged in, or outside, the body of fluid.
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