On-line fishing depth indicator with encapsulated components

An on line, trollable fishing depth indicator for monitoring the water depth of a trollable fishing bait when both the depth indicator and the bait are secured to and trolled by a fishing line, the fishing depth indicator of the type including an elongate body having an outer peripheral wall, opposite closed ends and a hollow interior cavity, through ports in the body and in communication with the cavity, means for securing the body to a fishing line in combination with a fishing bait for trolling the body through the water with the fishing bait, and a pressure sensor in the cavity and in communication with the ports for reading the water pressure in the ports and producing in response thereto a usable output signal indicating the water depth of the transducer, the trollable fishing depth indicator further comprising:

• a. electronic means housed in the cavity and in communication with the pressure sensor and adapted for producing an electronic signal in response to the usable output signal;
• b. a visual readout device housed in the cavity and adapted for receiving the electronic signal and producing therefrom a visual readout indicating the depth corresponding to the pressure sensed by the sensor;
• and
• c. an insulating material enveloping the electronic means and the visual readout device and sealing same in the cavity.