Search results
Results from the WOW.Com Content Network
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 observer's position is somewhere along the position line, not necessarily at the found longitude at the assumed latitude. If two or more sights or measurements are taken within a few minutes of each other a 'fix' can be obtained and the observer's position determined as the point where the position lines cross.
When taken together, autonomous civilian GPS horizontal position fixes are typically accurate to about 15 meters (50 ft). These effects also reduce the more precise P(Y) code's accuracy. However, the advancement of technology means that in the present, civilian GPS fixes under a clear view of the sky are on average accurate to about 5 meters ...
It is first the average daily precision in 6 positions and 2 temperatures, over 4 days (4 × 24 hours). A user is simulated who wears the watch on their wrist in different positions of their arm; the 2 temperatures represent the temperature when the watch is worn by the user (approx. 33 °C) and when the watch is removed (approx. 23 °C).
The positions at which electrodes are placed can slightly change the tuning as well. If the crystal is accurately shaped and positioned, it will oscillate at a desired frequency. In nearly all quartz clocks and watches, the frequency is 32 768 Hz , [ 1 ] and the crystal is cut in a small tuning fork shape on a particular crystal plane. [ 2 ]
Arm position affects blood pressure accuracy because it influences the reading’s relationship to heart level, says Danielle Belardo, M.D., preventive cardiologist in Los Angeles. “When the arm ...
Mariners would use the chronometer to set a so-called hack watch, which would be carried on deck to make the astronomical observations. Though much less accurate (and less expensive) than the chronometer, the hack watch would be satisfactory for a short period of time after setting it (i.e., long enough to make the observations).
Adding to this, the researchers found that 16% of those in the study who didn’t have high blood pressure when they were seated had high blood pressure readings in a supine position (a.k.a. lying ...