Systems and methods for adaptive cancellation of carrier content includes receiving a signal, adaptively detecting an amount of carrier content in the received signal, generating a feedback signal for canceling out the carrier content in the incoming signal, and introducing the feedback signal for canceling out a majority of carrier content in the signal being received. In the reverse bias case, there is a small reverse bias current but the voltage across the Schottky diode remains small due the MOS transistor. The navigation terminal or the route information server automatically sets a location most appropriate and convenient to all parties of appointment, thereby enhancing convenience and effective time management. The upwardly folded longitudinal sides form upstanding barriers to limit the likelihood of failure as a result of side leakage.