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The MD41-( ) is a compact, self -contained GPS annunciation and Control unit. It meets all requirements for external (remote) mode selection and status annunciation for the Garmin GNS 430/530 VHF Communication and Navigation Management System. Features include dual 20,000 hour lamps used for all annunciations, internally lighted selection switches and automatic photocell dimming. An external annunciation dimming adjustment is provided for balancing low level light conditions.