Harken 7311.10 Cruising Jib Reefing & Furling - Manual (Page 26)

Reef
A sail may be partially furled before you resume
sailing. This is known as reefing.
Many sailors find it helpful to place marks on
foot of sail so that they can reef to a variety of
predetermined jib sizes. This allows marks to be
placed on jib lead tracks or toe rail so that lead
block position can be changed to correspond
to reefed jib.
Sails are generally reefed to balance boat and to
reduce heeling moment. Sails may also be reefed
to improve visibility or to slow boat while sailing in
congested areas or while entering or leaving harbors.
Secure Sail
When furling prior to leaving your boat in slip or
on mooring, be sure that you get a tight furl and
continue furling system until sheets wrap around
rolled sail two or three times. Some people secure
sail with shock cord or sail ties. Be sure to securely
cleat furling line to a standard horn cleat.
You may also lock your system by aligning holes
in bottom of drum and basket and then using a
line to secure drum.
Be sure that mooring lines are not placed across
furling line where they may cause chafe.
Operation Reef/Secure Sail
26 Unit 1, 2 Cruising 5/30/08