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The difference is known as the drift, and can be determined by the wind triangle. At least seven ways to measure the heading of a vehicle have been described. [1] Heading is typically based on cardinal directions, so 0° (or 360°) indicates a direction toward true north, 90° true east, 180° true south, and 270° true west. [1]
Some drift meters were purely optical (e.g., USAAF Type B-5 drift meter), while others included electrically powered gyroscope (e.g., USAAF Type B-3 drift meter). [2] USAAF Type B-5 drift meter was also equipped with a simple flight computer (a rotating wheel) to calculate the ground speed from the measured time that takes for a ground object ...
Step 5. Measure length of course by using speed of 8.8 knots and converting into nautical miles via the time, speed, and distance scale; Step 6. Connect the two ends of the vectors from the current course to the course made good. Thus creating your set and drift vector; Step 7. Using the navigational triangle, place on set and drift vector.
Because water currents or wind can cause a craft to drift off course, a navigator sets a course to steer that compensates for drift. The helmsman or pilot points the craft on a heading that corresponds to the course to steer. If the predicted drift is correct, then the craft's track will correspond to the planned course to the next waypoint.
To counter for the effect of Earth rate drift a latitude nut can be set (on the ground only) which induces a (hopefully equal and opposite) real wander in the gyroscope. Otherwise it would be necessary to manually realign the direction indicator once each ten to fifteen minutes during routine in-flight checks.
Applying an electric field adds to this random motion a small net flow in one direction; this is the drift. Drift velocity of electrons . Drift velocity is proportional to current. In a resistive material, it is also proportional to the magnitude of an external electric field. Thus Ohm's law can be explained in terms of drift velocity. The law ...
Direction determination refers to the ways in which a cardinal direction or compass point can be determined in navigation and wayfinding.The most direct method is using a compass (magnetic compass or gyrocompass), but indirect methods exist, based on the Sun path (unaided or by using a watch or sundial), the stars, and satellite navigation.
The surface float contains alkaline batteries, a satellite transmitter, a thermistor for sub-skin sea surface temperature, and sometimes other instruments that measure pressure, wind speed and direction, or salinity. [5] SVP buoy fitted with a barometer (photo by DBi) The drifters are deployed from research vessels, volunteer ships, and through ...