Interface and annunciation device that combines navigation source switching to pilot's primary CDI or HSI with key GPS selection and annunciation functionsTransfers Navigation display between VOR/LOC and approach certified GPS systemsProvides up to 19 user defined relay polesTSO C129 Approved to meet NEW FAA field approval requirementsLighted push buttons and daylight readable annunciatorsPush-button lighting level is controlled by the instrument lighting rheostatAnnunciator lighting is automatically dimmed by means of a photocell feedback circuitAvailable in Horizontal or Vertical configurationAvailable with 5, 14, or 28 Volt lightingAvailable for most GPS manufacturers