Number of Shackles to Use
The number of shackles to veer depends upon a number of factors:
(a) Holding characteristics of the anchor.
(b) Length of stay.
(c) Strength of wind, tidal stream or current, and sea / swell.
(d) Swinging room.
(e) Type of cable.
(f) Depth/draught ratio.
(g) Nature of bottom