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In this paper, we report two evaluation results of ASR (automatic speech recognition) for a car navigation system, first interface evaluation results using a commercial product and second ASR module evaluation results for noisy in-car speech. In the first evaluation, we report many undesirable OOV (Out Of Vocabulary) utterances which make the interface worse. To overcome this problem, we propose a sophisticated interface which can handle OOV problems. Next, we carried out ASR module evaluation for the noisy in-car real speech gathered using driving car. We used free Continuous Speech Recognition (CSR) software Julius/Julian as a speech decoder.