A hand-held, compact fixed mounted or mobile optical symbol scanner assembly has a powered socket into which an active or passive illumination module can be installed. One or more embodiments can include a computing device with a VMM hosting a first information domain VM, a second information domain VM, and a cross-domain solution VM that controls information transfer between the first information domain VM and the second information domain VM. The coarse synchronization technique applies a sliding window differentiator to the output of a conventional auto-correlator to mitigate the plateau effect associated with conventional auto-correlation techniques. Preferably, the retention adhesive is permanently secured to the release member and temporarily adhered to the strap. In another embodiment, the fishing rod is secured inside the cover portion and compartments are detachably secured inside the base portion.