Read the passage and evaluate the statement below.
An aircraft pitot-static system measures air pressure to operate three primary flight instruments: the airspeed indicator, the altimeter, and the vertical speed indicator. Forward motion forces ambient air into the pitot tube, generating ram air pressure. To prevent icing at high altitudes, the pitot tube contains an internal electric heating element. Flush-mounted static ports located on the aircraft fuselage measure undisturbed atmospheric pressure. The airspeed indicator requires differential input from both the pitot tube and the static ports to determine velocity. In contrast, the altimeter and vertical speed indicator connect exclusively to the static ports and do not utilize ram air pressure. Pre-flight inspections require personnel to verify that moisture drain openings in the lines remain unobstructed.
Based on the passage, the vertical speed indicator relies on both ram air from the pitot tube and atmospheric pressure from the static ports.
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