1. An apparatus comprising: a body defining a body coordinate system; a navigation sensor defining a sensor coordinate system, wherein the navigation sensor comprises (i) a light source and (ii) a sensor exposed through an image aperture, and wherein a transverse axis of the sensor coordinate system runs through each of the light source and the image aperture; and a position module configured to control the navigation sensor to capture a plurality of navigational images, and determine a position of the apparatus based at least in part on the plurality of navigational images, wherein the transverse axis of the sensor coordinate system and a transverse axis of the body coordinate system are neither parallel nor perpendicular to each other.