A few entering arguments:
1.It is difficult if not impossible to be certain of bottom holding
conditions outside of your area of experience.
2. Different anchors behave differently in different bottoms.
3. The anchor set is not as important as the reset when the large gust turns
the boat well off the original set axis and it races off toward the rocks.
More by accident than design I have stumbled on a technique that aids me
greatly in overcoming these imponderables.
Required items are a spare laptop with a cellular air card or USB
modem(Verizon). Two marine Gps's (I use Garmin 76"s) , Radar (optional)
In two seasons (6 mo ea) and 5000 miles cruising we have been unable to
connect to the Internet perhaps a dozen nights( NC not withstanding). Well
before reaching our daily destination we look at Noaa doppler weather radar
on the Internet to get a feel for what we can expect late in the day or
overnight.(Skipper Bob and Active Captian are other essentials) This usually
determins anchorage choice and style. Once anchored we set up the two
Garmins on large scale anchor watch(belt and suspenders) and check them
periodically to understand swing pattern limits. Then search the Internet
for TV stations in the area that have almost real time doppler radar sites.
Most major cities do. These are a better scale than NOAA and have additional
bells an whistles such as direction arrows with time of passage estimates.
The technique then is to make and estimate of when the front (most often the
source of violent storms) will be here. If beyond bed time (sundown) set the
alarm clock 30min prior and go to sleep. Wake up and get comfortable in the
helm seat Carefully study the Garmin patterns. Start the radar. Bring up the
tv or Noaa radar on the laptop and study the storm color coded winds.
Doppler radar is remarkably accurate in portraying wind speeds and with
experience you can predict what is coming at you (or better just going to
miss you) within 10 if not 5 mph. When a purple blob (35+) is aimed right at
you, Start the engine and let it idle. Get a caffeine free coke to avoid dry
mouth.. When the gusts hit insure that the boat does not exceed the previous
swing pattern plus centenary or nylon stretch. The "crumb drop" pattern
gives you a good idea of where the anchor is especially if you are swinging
on a tide. Watch the rocks on the radar if you swing to a new direction. If
it becomes evident that the anchor is threatened or dragging nudge into gear
and add throttle ONLY DURING THE GUST usually a few seconds. I do not steer
our single. A twin could probably use the proper engine to correct against
the yaw. Normally big gusts are few an you can observe the cell system
rapidly pass. Rarely takes more than 30 minutes. When all is clear shut
every thing down but the Gamin's If still daylight consider some adult
muscle relaxer.. If at night go back to bed and sleep well when your heart
rate gets below 100. It would be a good idea to practice the throttle/gear
technique in a high wind w/o storm conditions to get a feel for how many
RPM's it takes to hold your position in 30kts or so.
On our 42'X26klb pilothouse with moderate wind cross section we use a 75lb
Super Max and have only felt it necessary to add power 2-3 times in the two
fairly stormy seasons and lots of anchoring Fla to Canada. Usually our
biggest worry is getting the anchor and 200lbs of sticky mud out of the
bottom and clean after a blow. A horse and a half 115v lawn pump is
essential for that chore.
Certainly not a perfect technique nor for the feint of heart. However it has
increased our anchoring "comfort level" greatly and relieved budget $'s for
more fun things than making marina operators rich.
Larry Ropka
"Charis" 42' Pilothouse
Soon to be unshrinkwrapped in the Solomons
I am speechless in awe that all I need is a spare laptop, an air card, a
city on the doorstep, and a comfy helm seat to enjoy a safe anchor night.
Richard
Certainly not a perfect technique nor for the feint of heart. However it
has
increased our anchoring "comfort level" greatly and relieved budget $'s
for
more fun things than making marina operators rich.
Larry Ropka
"Charis" 42' Pilothouse
Soon to be unshrinkwrapped in the Solomons
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09:44:00