The speedometer defined in claim 1, in which the indicating means is remote from the calculating means and includes a head-mounted display.ĥ. The speedometer defined in claim 2, in which the wave-transmitting means includes means for transmitting electromagnetic waves downward and forward relative to the direction of movement of the sportsman.Ĥ. The speedometer defined in claim 1, in which the wave-transmitting means includes means for transmitting electromagnetic waves through the air toward the stationary medium at a range of angles relative to horizontal but centered about a median angle and means for detecting waves reflected from the stationary medium through a corresponding range of angles, and in which the calculating means includes means for performing a frequency analysis to determine the median frequency of detected reflected waves and for using such median frequency to calculate an approximation of the forward speed of the sportsman taking into consideration the median angle of transmission of the waves.ģ. A speedometer for a self-propelled sportsman moving by his or her own force or momentum along a stationary medium comprising means mounted for movement with the sportsman for transmitting waves toward the stationary medium and for detecting such waves reflected from the stationary medium, means mounted for movement with the sportsman for measuring the difference in frequency between the transmitted and reflected waves in accordance with the Doppler effect, means mounted for movement with the sportsman for calculating the speed of the sportsman from such frequency difference, and means mounted for movement with the sportsman for indicating such speed.Ģ. If you think about your approach you'll be able to comfortably boat in rough water and still have a lot of fun.1. Think of seas as a natural rollercoaster. A slower speed keeps you from burying your bow in the water column. Speed up as you approach a wave and when you crest the wave slow down. Boats getting pushed around by swells coming from behind should maintain a speed that allows you to keep your boat perpendicular to the swells. When the prop comes out of the water you're powerless and your steering is temporarily lost. Boating in rough water can be tough when swells come from your stern. That way you'll avoid the side-to-side instability that comes with broadside swells. The time to turn is when you're in the trough. The best way to handle is to get out of that situation by tacking back and forth on a 45 degree angle so you're meeting head seas. You'll ride up the trough to the peak and back down again. That can be difficult for there is a lot of rocking and rolling that occurs as the waves run under your boat. Sometimes port requires boaters to run in a trough. The perfect speed is one that is slow enough to keep your bow from plunging into the oncoming wave and fast enough to keep the crest from filling the cockpit. Head seas follow in sets of four, and the best way to navigate is to slow your speed so you can ride up and over the waves. When rough water boating, take a heading that is 45 degrees to the wave.
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