1. At least one non-volatile computer memory storing computer-executable instructions for determining an angle of a target object with respect to a device, the determining the angle comprising: receiving a first image captured using a first camera on the device and a second image captured using a second camera on the device, wherein the first camera is spaced a distance apart from the second camera on the device, and wherein the first and second images are captured at approximately a same capture time; determining a correlation value for a correlation between the first and second images; accessing a tuning table having image-to-image correlation values and corresponding angles; and retrieving the angle corresponding to the image-to-image correlation value closest to the determined correlation value.