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A drift meter consists of a small telescope extended vertically through the bottom of the aircraft with the eyepiece inside the fuselage at the navigator's station. A reticle, typically consisting of spaced parallel lines, is rotated until objects on the ground are seen to be moving parallel to the vertical lines.
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A dado (US and Canada, / ˈ d eɪ d oʊ /), housing (UK) or trench (Europe) is a slot or trench cut into the surface of a piece of machinable material, usually wood. When viewed in cross-section, a dado has three sides. A dado is cut across, or perpendicular to, the grain and is thus differentiated from a groove which is cut with, or parallel ...
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The housing contains a data logger that records the orientation (angle from vertical and compass bearing) of the Tilt Current Meter. Floating tilt current meters are typically deployed on the bottom with a lead or concrete anchor but may be deployed on lobster traps or other convenient anchors of opportunity. [ 5 ]
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The original design was only suitable for low-level use and was later known as the Low Height Drift Sight Mk. I . At higher altitudes the indicated airspeed - being measured by pitot tube instruments - was affected by differences in outside air pressure that rendered it increasingly inaccurate.
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