I have a Deep Hunter Module. It mounts in the back of a Viper or Cobra II. I'm not sure about what others had the moduler design. The module has a 10 pin(2 rows of 5 pins) header on it. Your main PCB inside would need a mating connector.
The module is basically a DC-DC converter that raises the voltage going to the transmit oscillator. This would increase the current in the transmit windings and should give a little more depth. Probably not really usable in heavily mineralized ground.
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