The reel unit of a dual-bearing reel includes a frame, first and second side covers, an operating lever, and guard members. The improvement includes an electro-optic modulator added between a light source and a first modulator, to regulate a power of the light beam supplied to the first modulator. A current mode setpoint circuit has multiple voltage dropping current paths, through one or more of which a summation of the diverted load currents are programmably directed, to generate a control voltage for controlling the operation of a pulse width modulator unit of the regulated power supply. Additionally, an auxiliary power system can be used to power the components and various electrical and electronic systems that may be present in the invention for controlling the engine components. A mobile station and a mobile network gateway node each include a mapper for mapping an individual application flow to one of a circuit-switched network and a packet-switched network bearer depending on the quality of service requested for the individual application flow.