1. A method for avoiding surge in a vehicular fuel cell system compressor, said method comprising: maintaining, within a memory, a compressor map corresponding to the operation of the compressor; controlling the compressor using a default strategy such that its operation approaches a setpoint within the compressor map; and upon detection of a surge condition within the compressor, utilizing a first surge mitigation strategy that regulates a cathode backpressure valve if the compressor is operating at a speed above a threshold value, or utilizing a second surge mitigation strategy that regulates a recirculation valve if the compressor is operating at a speed below the threshold value.