Explanation: An Electronic Chart System (ECS) is designed to integrate various sensor inputs to provide comprehensive navigational information. Key data inputs for an ECS include: * **Position:** Essential for displaying the vessel's location on the chart, typically provided by a Global Navigation Satellite System (GNSS) receiver like GPS. * **Speed:** Used for calculating speed over ground (SOG), estimated time of arrival (ETA), and drift, usually from a speed log or GNSS. * **Depth:** Provided by an echosounder (fathometer) to display current water depth and aid in avoiding grounding. * **Radar:** Allows for overlaying real-time radar targets and coastline data onto the electronic chart. The Ship Security Alert System (SSAS) is a completely separate maritime security system. Its purpose is to transmit covert security alerts to competent authorities in the event of a security threat onboard, not to provide navigational data to an ECS. Therefore, SSAS is not an input for the operational functions of an ECS, making the list in option A incorrect. Options B, C, and D all include valid data inputs for an ECS.