Rapidly fluctuating may be hidden behind waves up to 50 % of the time. Small open boat, Slow moving targets tend to lie fibreglass, wood or lower in the water than fast rubber with outboard 0.5 5 moving ones and therefore – 0.5 to 1 motor and at least 2 C m2 RCS visible to the radar tends m ASL persons onboard, small speedboat, small to increase with speed. fishing vessels or small Humans and non-metallic sailing boats. targets will give poor radar return in case of circular polarisation Inshore fishing vessels, sailing boats and 1 to 2 m speedboats, D 3 10 m2 Rapidly fluctuating. – ASL equipped with radar reflector of good quality. Small metal ships, fishing vessels, 10 100 2 to 4 m – E Moderately fluctuating. patrol vessels and m2 ASL other similar vessels. Coasters and other 100 1000 6 to 10 – F similar vessels. m2 m ASL Large coasters, Bulk RCS is highly dependent on carriers, cargo ships 1000 10 to 25 – aspect angle of the individual G and other similar 10,000 m2 m ASL vessel. Rate of fluctuations is vessels. typically moderate. Container carriers, 10,000 – 15 to 40 tankers and other H 2,000,000 m ASL m2 similar vessels. Buildings, cranes. Up to Stacks of containers Insignificant. I 1,000,000 and other large s on site m2 structures. Floating items, oil 0 to 0.5 drums and other Rapidly fluctuating, highly m ASL J similar items. dependent on sea Up to 1 m2 characteristics and target Sea movements. level Birds, floating or flying. and up Rapidly fluctuating, flight paths Sea tend to be characteristic of K Up to 3 m2 level Flocks of birds. given species in given areas of and up interest.
C Small open boat, fibreglass, wood or rubber with outboard motor and at least 2 persons onboard, small speedboat, small fishing vessels or small sailing boats. 0.5 – 5 m2 0.5 to 1 m ASL Rapidly fluctuating may be hidden behind waves up to 50 % of the time. Slow moving targets tend to lie lower in the water than fast moving ones and therefore RCS visible to the radar tends to increase with speed. Humans and non-metallic targets will give poor radar return in case of circular polarisation D Inshore fishing vessels, sailing boats and speedboats, equipped with radar reflector of good quality. 3 – 10 m2 1 to 2 m ASL Rapidly fluctuating. E Small metal ships, fishing vessels, patrol vessels and other similar vessels. 10 – 100 m2 2 to 4 m ASL Moderately fluctuating. F Coasters and other similar vessels. 100 – 1000 m2 6 to 10 m ASL RCS is highly dependent on aspect angle of the individual vessel. Rate of fluctuations is typically moderate. G Large coasters, Bulk carriers, cargo ships and other similar vessels. 1000 – 10,000 m2 10 to 25 m ASL H Container carriers, tankers and other similar vessels. 10,000 – 2,000,000 m2 15 to 40 m ASL I Buildings, cranes. Stacks of containers and other large structures. Up to 1,000,000 m2 on site Insignificant. J Floating items, oil drums and other similar items. Up to 1 m2 0 to 0.5 m ASL Rapidly fluctuating, highly dependent on sea characteristics and target movements. Birds, floating or flying. Sea level and up K Flocks of birds. Up to 3 m2 Sea level and up Rapidly fluctuating, flight paths tend to be characteristic of given species in given areas of interest. s
VTS36-34%20Draft%20revised%20%20V128%20ed%204%20rev%2017%20-%20chapters%201-8.docx