Carrier-based aircraft should land on the centerline of angled flight deck on aircraft carrier. Due to the movement of aircraft carrier, the pilot cannot directly aim the velocity vector symbol in head-up display (HUD) at the centerline of angled flight deck. Instead, the pilot needs to aim the velocity vector symbol at the right of the centerline of angled flight deck based on the velocity of aircraft carrier, the velocity of carrier-based aircraft and pilot’s experience, which brings a great burden to the pilot and affects the accuracy of landing. Ship relative velocity vector (SRVV) allows the pilot disregard the impact of the movement of aircraft carrier, so the pilot can aim SRVV symbol in HUD at the centerline of angled flight deck rather than the right of the centerline. The concept of SRVV was first introduced in Maritime Augmented Guidance with Integrated Control for Carrier Approach and Recovery Precision Enabling Technologies (MAGIC CARPET), however, no existing literature has provided a method for calculating SRVV. In this paper, a calculation method for SRVV is proposed. This paper analyzes the driving principle of velocity vector symbol and the relative motion of carrier-based aircraft and aircraft carrier, derives the calculation method for SRVV and simulates the calculation method. The simulation results show that applying SRVV symbol to land is more accurate than applying velocity vector symbol to land, which indicates that the proposed calculation method can calculate SRVV and drive SRVV symbol effectively.