Guidepost extension

A releasable guidepost extension for use on the seabed together with a seabed fixed guidepost part, which parts together make up a guidepost for assistance during lowering of a component from the surface of the water to a subsea structure to obtain a focused landing of said component at a predetermined location, said guidepost part includes an upward (in the position of use) projecting end designed for engagement with a lower (in the position of use) end of the guidepost extension, wherein the guidepost extension is loosely connected to the seabed fixed guidepost part via a pin and socket part on respective ends, that a gap, or clearance, exists between the pin and socket part in the longitudinal direction thereof, and that at least one friction forming device is arranged in the gap on either the pin part or in the socket part, said at least one friction forming device does not get in contact, or engaged, with the other part unless the guidepost extension is subjected to a lateral force.