lag·an 
(lăgən) also li·gan (līgən) or lag·end (lăgənd)
(lăgən) also li·gan (līgən) or lag·end (lăgənd)n.
Cargo or equipment thrown into the sea but attached to a float or buoy so that it can be recovered.
[French, from Old French, possibly from Old Norse lögn, lagn-; see legh- in the Appendix of Indo-European roots.]