| 摘要 |
To make it possible that a user of a fish detector for a fishing from rocks near the shore, which possesses an arm-portable type data display unit, can simply and surely know an approach of a fish shoal. An arm-portable type data display unit possesses a function of judging the approach of the fish shoal by receiving a radio signal from an ultrasonic sensor unit and generating a fish shoal approach signal. The arm-portable type data display unit possesses a vibration type notification section comprising a motor driving circuit and a vibration motor. The arm-portable type data display unit drives the vibration type notification section on the basis of the fish shoal approach signal to give a vibration to the user, thereby notifying the approach of the fish shoal.
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