{Stus-List} Raymarine ST60+ problem -now depthmeter offset

Patrick H. Wesley hickland at telus.net
Thu Jul 1 14:28:47 EDT 2010


Depth below keel works for me.

 

Patrick Wesley

s/v "The Boat" C & C 24

Westport Marina, Sidney BC

 

From: cnc-list-bounces at cnc-list.com [mailto:cnc-list-bounces at cnc-list.com] On Behalf Of randy
Sent: July-01-10 7:38 AM
To: cnc-list at cnc-list.com
Subject: Re: {Stus-List} Raymarine ST60+ problem -now depthmeter offset

 

Actual depth, but the boat I race on, and take offshore, and cruise in the islands uses a keel offset.  Makes life interesting as I'm back and forth between boats!...

 

randy

Tamanawas

29-II

Hood River, OR


----- Original Message -----
From: "Dennis C." <captbuy at yahoo.com>
To: cnc-list at cnc-list.com
Sent: Thursday, July 1, 2010 4:39:24 AM GMT -08:00 US/Canada Pacific
Subject: {Stus-List} Raymarine ST60+ problem -now depthmeter offset

Just curious how many listers use an offset for their depthmeter and which they use?  I adjust offset to give actual depth so I can compare to charted depth.  On the other hand, a couple of my friends want clearance under keel.

 

Dennis C.

Touche' 35-1 #83

Mandeville, LA

 

  _____  

You are correct, Dwight.

 

Rich Knowles
INDIGO LF38
Halifax, NS.



 

On 2010-06-30, at 8:32 PM, dwight veinot wrote:

 

I think I got what you mean.  But I didn’t think the off set had anything to do with the actual sound wave from the transducer…I thought it was simply an imposed numerical correction on the readout.  I set it to measure depth from the surface by adding +2 feet when I did the install

 

Dwight Veinot

1974 C&C 35, Alianna

Head of St. Margaret's Bay, NS

 

  _____  

 

You may be getting a reflection off the keel.  Have you tried changing the offset?  The offset allows your depth sounder to measure depth from the bottom of the keel. If the offset is set at minus four feet (distance from the sensor to the bottom of the keel), for example, and reflection off the keel says your depth is two feet, the depth sounder might be confused into thinking that you're aground.  If you set the offset to plus two feet (distance from the sensor to the waterline) you are actually measuring the depth of the water.  (I might have my plus and minus signs reversed since I'm doing this from memory, but I'm sure you get the idea.)

Alan Bergen
C&C 35 Mk III Thirsty
Rose City YC
Portland , OR



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