Alfredo Contaldovideo
INTERCEPT COURSE - nautical license chartwork beyond 12 miles - intercept kinematics all cases ⛵
9 December 2023 · 38 min · 23K views
What this video covers
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
More from Alfredo Contaldo
From Alfredo Contaldo — see the channel’s boat, crew, and every analysed video.
The Sailing Directory Newsletter
One email with the fleet's best finds — the moments, boats, and stories worth your watch time. Enter your own address to get your own copy.