Regal 3300 Owner's Manual page 141

Bow springs are secured at the vessels bow area. Forward spring lines
lead forward from the boat to the dock and control movement toward
the stern. After springs stem aft from the vessel, and stop movement
ahead. Spring lines are used to prevent movement in a berth, ahead or
astern. They are really useful in controlling the effects of a real active
tidal surge. Spring lines are useful where fenders need to be kept in
place against piles.
1.
=FENDER
Boat Mooring
Most boats can be secured to a dock using four lines. The after bow
spring is crossed with the forward quarter spring and secured to
individual dock cleats or pilings. This ensures longer springs and can
be snugged up tighter for more efficient tidal control. Remember, if
you only have one piling available, position the vessel so this point is
opposite admidships. Run both spring lines to it. These lines will be
shorter but still useful.
https://www.boat-manuals.com/
TYPICAL PIER MOORING
3.
2.
TYPICAL PILING MOORING
Vessel Operation
4.
1. Bow line
2. After bow spring
3.Forward quarter spring
4. Stern line
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