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Event sensor

  • US 9,098,083 B1
  • Filed: 01/28/2011
  • Issued: 08/04/2015
  • Est. Priority Date: 02/11/2005
  • Status: Active Grant
First Claim
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1. A system for detecting a water course, comprising:

  • a timing device;

    a position observer subsystem;

    a computing device in communication with the position observer subsystem and the timing device; and

    a non-volatile storage coupled to the computing device and storing locational information describing a plurality of different water courses that each include an entrance point and a centerline;

    wherein the computing device is configured, subsequent to the storing of the locational information in the non-volatile storage, to;

    receive an observed position and an observed velocity of a watercraft from the position observer subsystem;

    compare the observed position and the observed velocity with the locational information describing the plurality of different water courses to determine a detected water course from the plurality of different water courses that is closest to the observed position, that the observed position is outside of the detected water course, and that the watercraft is approaching the entrance of the detected water course from a direction that is along the centerline of the water course; and

    determine that the watercraft has crossed the entrance of the detected water course and, in response, automatically start a course timing algorithm and time the watercraft through the detected water course using the timing device.

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