Apparatus for performing optical scanning functions, wherein the apparatus includes an exterior scan module to facilitate a compact size. That is, the scanning apparatus in accordance with the present invention is made smaller by way of a deployable guide track and an external scan module that is configured to be guided by, and to move relative to, the guide track while performing scanning functions. The guide track can be configured to be extendable and/or retractable from a base unit that can also be included in the apparatus. The guide track can thus be coiled when retracted, or alternatively, can be foldable, or telescopic.