[C320-list] Calibrate Knotmeter

[Stanley Rogacevicz]

   The reason I  - had to -  calibrate my knot meter was because it was
wrong at delivery. Full throttle in flat calm and slack tide was 5kts
while the GPS was giving me my correct speed of 7kts Over Ground and
Through the flat non moving Water..... so the only way to correct the
knotmeter was to do the' best' re-calibration I could by using the GPS
speed as a reference in flat water at slack tide at the middle of the
knot meters scale.
Stan
formerly "Christy Leigh" #656

>>> <Orlando.Duran at AveryDennison.com> 9/29/2006 3:35 PM >>>
Since these two instruments are used to measure different types of
'speed', they should almost never have the same reading...trying to
calibrate so they read the same is a useless process.

OD


                                                                       
  
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Subject 
                                      Re: [C320-list] Calibrate
Knotmeter 
                                                                       
  
             09/29/2006 12:26                                          
  
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   As the other Stan says.. It's not a linear adjustment... the 1, 2
or
whatever adjustment number you use seems to be a factor in the
calculation not just a plus or minus. So I'd say the best speed to do
your adjustment at is around 4.5 - 5k to minimize your error ....
unlike
I did my first time at 2k because it made the math easy with the known
distance run I was doing.... accurate at 2k or 3k but waaay...off at
5k
or 6k - useless.
Stan
formerly "Christy Leigh"

>>> Stan <ola7442000 at gmail.com> 9/29/2006 2:31 PM >>>
I gave up a long time ago.  It's not a linear adjustment. i.e. On my
boat
between approximately 4.5 - 5.5 Kts. it matches the SOG.  Below 4.5
its
reads low. Above 5.5 it reads high.

I'm not really sure how this can be as the the little spinning wheel
is
sort
of a generator.  The faster it spins, the higher the voltage it will
put
out.  The output voltage is scaled to Kts.  It should be a straight
forward
calibration, but it is not.  As I said, I gave up.  I just use the SOG
since
I'm on a lake.

Stan
"Our Little Amusement" #744

PS  Moving to Las Vegas tomorrow.  The boat will follow in Jan. or
Feb.
depending when I get a slip at Lake Mead. (4-5 month waiting list)


On 9/29/06, Irv Grunes <igrunes at comcast.net> wrote:
>
>
> Guys,
> Have gone crazy trying to understand the manual on calibration of
the
> knotmeter.
> Have not been able to decipher it.
>
> Can anyone describe is some detail the process so that the knotmeter
will
> read the same as SOG over still flat water.
>
> Ours has never read correctly.
>
> Irving Grunes
> Isle of Wight #851
>
>
>
>
>


--
Stan
C320 "Our Little Amusement" #744
__/)__/)__/)__/)__





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