A multiband heterodyne receiver, and method, having a source of a received signal, a local oscillator that outputs a local oscillator signal, and a mixer that combines the received signal and the local oscillator signal to generate a combined signal. The car navigation system includes a trifurcate guidance section that makes a decision of considering two consecutive bifurcate guidance nodes among guidance nodes stored in a guidance node storing section as a single trifurcate guidance node, and makes a decision of a guidance direction to be provided as trifurcate guidance. The gap is filled with a gas such as air in some embodiments. In the unregistered mode, the controller may activate the user registration reminder indicator to encourage registration by the user. The resequencing algorithm of the present invention increases IOPS and reduced read head actuator travel and wear.