Abstract: A fishing apparatus sensing alarm unit having a processor and at least one sensor, the unit mounted to a fishing apparatus and configured to sense apparatus operation and provide an alarm sensing an apparatus operation event. Sensor can be a motion sensor and the unit mounted to a movable component of the apparatus, sensing movement thereof, and alarming upon sensing movement. Apparatus can be an ice fishing tip up to which the unit is mounted to a movable component, such as a flagpole or shaft, thereof. Sensor can be a magnetic sensor and the unit configured for sensing movement of a magnet of the apparatus and alarming upon sensing magnet movement. Magnet is carried by a base, shaft, or cross bar of the tip up or a spool of a fishing reel with the unit configured to sense magnet movement and output a fish strike alarm upon sensing magnet movement.

Abstract: An alarm system for a fishing apparatus that is an ice fishing tip-up employing a sensor alarm unit with a housing, processor, sensor, power source, and onboard wireless communications, the unit mountable to one of a base and fish strike indicating flagpole of the tip-up with the sensor configured to sense a magnet on the tip-up during operation and cause the processor to alarm when a fish strikes. The unit has a mounting arrangement with a clamp releasably attaching the unit to the flagpole for movement in unison therewith from an armed position towards a fish strike indicating position. The mounting arrangement includes a twist-lock dovetail joint used to removably mount the unit to the tip-up base. The dovetail joint removably attaches the housing to a unit base mounted to the tip-up base. The unit can have another sensor that senses motion, orientation, angle, rotation of the unit.