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Calculating an intercept course on a nautical chart requires geometric vector analysis to determine the intercept point and time of approach. For basic intercepts without external factors like current, the navigator plots the position of both vessels and their respective velocity vectors.1:21 By connecting the tips of the velocity vectors for vessel A and vessel B, the navigator identifies the intercept point.2:59 The time of approach is calculated by dividing the distance from the starting position to the intercept point by the vessel's speed.4:00

When current is present, the navigator must account for the drift of all objects on the water.11:18 If vessel B is disabled and drifting, its movement is defined by the current's direction and intensity.13:28 To solve for an intercept, the navigator constructs a vector triangle that incorporates the current's velocity.16:46 By applying the current vector to the target's position and using the interceptor's speed, the navigator determines the effective course and speed required to reach the target.16:54 The final intercept point is found by extending the vector from the starting position through the key point established by the combined velocity and current vectors.24:24

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