Why do some avionics with the same model number vary so much in price?
Most avionics units have both a part number and model number. Some of those models will have several part numbers, which represent the various technical and functional options available within that model. For example, the KI-208 and KI-209 indicators contain an internal VOR/LOC converter. These units do not allow for direct GPS connection. However, the KI-208A and KI-209A include a relay, which allows them to bypass the converter for GPS deviation indication. Therefore, units that contain all the features and capabilities within a particular model, usually command a higher value.
