Good question. 

I believe that it measures speed of the boat instead of speed over ground which 
is helpful when you are trying to judge movement and sail trim versus how fast 
the tide could be moving the boat.  

I know there are other sensors now that measure without the paddle.  


> On Sep 14, 2018, at 9:03 AM, Dan via CnC-List <cnc-list@cnc-list.com> wrote:
> 
> Hi all,
> I'm doing an overhaul of my electronics, and I have a general question for 
> those of you who have been through this before - Are the classic Padwheel 
> Speed Measuring instruments still worth keeping or have they gone the way of 
> the Steam Engine?
> 
> I'm pretty sure most Depth Transducer readers now mathematically calculate 
> your speed from comparative readings, and just about any GPS device including 
> your phone will give your speed through any plotting software... So what do I 
> do with this old padwheel? - disconnect and plug or patch over the hole on 
> the next haul out?
> 
> Dan
> Breakaweigh
> C&C44
> Halifax, NS
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