A stackable buoy can be mounted on a U-shaped mounting bracket that can in turn be attached to a panel, such as the inner surface of a boat hull. An interference signal, which has occurred during the transmission of the transmit data symbol sequence, is detected in dependence on a received data symbol sequence, and the data symbol of the transmit data symbol sequence, which data symbol was transmitted last, is repeatedly transmitted from the first transceiver to the second transceiver when the interference signal occurs. A set of actual registers is indirectly accessed by the processor via map entries of the set of maps. The thermally conductive plug comprises an isotropic thermal transfer material and the thermally conductive frame comprises an anisotropic thermal conductive material to provide for enhanced thermal transfer from the heat generating component to a chassis. The JFET area also includes an enrichment region under the second portion of the gate oxide. All necessary analog and digital circuitry, microprocessor, programming, communications hardware are integrated into the collar.