[C320-list] Depth Transducer Offset

[John Meyers]

I appreciate Rick's commentary that risk is important. But I would prefer
accuracy over guessing, or approximation so that I didn't need to calculate
true depth in the case where, for example, the tide is going out and if I
don't get out of a bay with a bar or other obstruction I will end up on the
bottom in one place or the other. I would want to know if I have only an
inch of clearance rather than guessing  There could be a variety of
circumstances that require exact knowledge with out estimating.  If there
are waves then that needs to be taken in account for the up and down effect
for clearance.

Fortunately, here in Lake Michigan we don't have tide, (salt or sharks) to
deal with.

John Meyers
#406
Muskegon MI, (most of the time)

On Thu, Jun 2, 2016 at 5:52 PM, Rick <rsulewski at bex.net> wrote:

> The depth alarm offset issue is a matter of which measure would you rather
> count on to avoid problems. How much risk is one willing to accept? A more
> conservative off set estimate might not consider always encountering flat
> water when entering a channel or one may consider a more risky proposition
> where the crest of a wave could provide one depth and the trough of that
> wave provides less depth under the keel. I found that on my Hull # 277 that
> the transducer is about 18-20 inches below the waterline just ahead of the
> keel while the depth at the keel is around 4 foot 3 inches below the normal
> waterline. Given the risk involved I found that having the offset alarm set
> at 3.5 or even 4 feet (plus 18- 20 inch transducer depth) provided me with
> an ample level safe measure where I sail. If one encountered moving sand
> bars or a more dangerous channel entry, I would increase the offset measure
> to 4.5 or even 5 feet with a 4 foot plus keel depth to allow for a
> deviation of an extra 1.5 to 2 feet below the keel to avoid  problems. How
> much time or $$$ does one need to risk changing directions when running out
> of depth? Considering the damage that could be done to the keel, rudder and
> hull, which offset depth suits the size of your wallet?
> Rick Sulewski
> 1995 C320 hull # 277
>
> -----Original Message-----
> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On
> Behalf Of stepkap
> Sent: Thursday, June 02, 2016 4:39 PM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Depth Transducer Offset
>
> Hull 980 was set by the yard to -2.5 ft.
> Steve
> Saline
>
> -----Original Message-----
> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On
> Behalf Of Daryl Hunt
> Sent: Thursday, June 2, 2016 9:57 AM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Depth Transducer Offset
>
>
>
> My offset is set to read depth below the keel, so it is specific to the
> hull #/year.
> Fair Winds, DarylDaryl HuntC320 #660 BelievePultneyville, NY - Lake Ontario
>
> -------- Original message --------
> From: Chris Burti <clburti at gmail.com>
> Date: 06/02/2016  12:08 PM  (GMT-05:00)
> To: 320 <C320-List at catalina320.com>
> Subject: [C320-list] Depth Transducer Offset
>
> Did anybody happen to record and save the depth transducer offset number
> for their C-320? All the hulls are the same, so it doesn't matter what
> year/hull #.
> Thanks,
> Chris Burti
> Commitment, #867
> Farmville, NC
>
>