An illustrative embodiment of an object locating apparatus includes a cartridge having a cartridge interior; a float in the cartridge interior; a float attachment line attached to the float and the cartridge; a water-dissolvable float retainer tablet retained in the cartridge interior; a cartridge cap in the cartridge interior; and a spring normally sandwiched and compressed between the cartridge cap and the float retainer tablet and adapted to expand and push the float from the container interior upon dissolving of the float from the retainer tablet.