A compact mounting device for releasibly securing a GPS receiver or other electronic accessory to a handlebar of a motorcycle or other handlebar-steered vehicle is described. The device includes a clamp releasibly attachable to a motorcycle handlebar; a cylindrical mounting post rotatably attached to the upper surface of the clamp; a mounting yoke pivotally attached to the mounting post; and a mounting plate to support a GPS receiver or other accessory rotatably attached to the yoke. The face of the accessory can be oriented toward the vehicle rider by rotating the post, tilting the yoke and/or rotating the mounting plate, so that the device is useable with a wide variety of handlebar orientations.