Alarm device for water depth
专利汇可以提供Alarm device for water depth专利检索，专利查询，专利分析的服务。并且PURPOSE:To permit identification of the approach to an intended fishing field and shoals without viewing displayed video by comparing the magnitude of the numerical value of the variable range mark set depth and the numerical value of sea bottom depth, and giving an alarm. CONSTITUTION:The searching range of fish groups or the like is shifted with a shift switch 24 and the scale of depth is digitally displayed with a variable shift mark VRM signal generating circuit 25, so that the depth of the displayee video is read directly. The shift quantity information from the switch 24 and the VRM signal from the circuit 25 are inputted to a scale data processing circuit 26. On the other hand, the figure of the sea bottom depth measured actually with a sea bottom detecting circuit 79 is conducted to a magnitude comparator 57, and is compared with the VRM display depth figure from the circuit 26. Selection is accomplished with a switch 80 to output to an alarm 58 so as to give an alarm when the sea bottom is shallower than the VRM for the prevention of wrecking of ships and when the seam bottom is deeper than the VRM in case that a fishing boat is heading toward the fishing field.，下面是Alarm device for water depth专利的具体信息内容。
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