An apparatus for mounting underwater marine detection equipment on a waterborne vessel is provided having a baseplate which is secured to a side of the waterborne vessel. The baseplate extends outward from the side of the waterborne vessel over the surface of the water. A shaft holder bracket is rotatably mounted to the baseplate such that the shaft holder bracket may rotate in a plane generallyparallel to the forward and reverse direction of the waterborne vessel from a first position to a second position. The shaft holder bracket has a through passageway to receive a shaft. An elongate shaft having an upper portion and a lower portion which are rotatably joined and separable, is slidably engaged through the passageway in the shaft holder bracket, such that the elongate shaft can rotate and slide within the shaft holder bracket. The shaft holder bracket has means to secure the elongate shaft from rotation and sliding. The elongate shaft has a handle on the top of the shaft and a marine detection equipment mount on the bottom of the shaft. The elongate shaft is long enough to extend below the bottom surface of the waterborne vessel when the shaft holder bracket is in the first position, and the elongate shaft is totally out of the water when the shaft holder bracket is rotated to the second position. The marine detection equipment mount is rotatably and adjustably attached to the lower portion of the elongate shaft, such that the marine detection equipment mount can rotate 360 degrees in a plane perpendicular to the surface of the water. The marine detection equipment mount has means to secure marine detection equipment.