{Stus-List} Nexus system - VMG vs WCV - report

Dennis C. captbuy at yahoo.com
Mon Jun 29 10:58:01 CDT 2009


Dwight,

I think you're correct.  The compass shouldn't be needed.

Dennis C.




________________________________
From: dwight veinot <dwightveinot at hfx.eastlink.ca>
To: cnc-list at cnc-list.com
Sent: Monday, June 29, 2009 9:45:10 AM
Subject: Re: {Stus-List} Nexus system - VMG vs WCV - report


So is it using the compass for boat heading or for apparent wind direction…as I understand it the only inputs required to calculate VMG (wind), are apparent wind speed, apparent wind direction and boat speed…is that what your test concluded for the Nexus system?  My raymarine st 60 system gives apparent wind direction without reference to any compass and the graphic display unit for the raymarine st 60 system calculates VMG wind from those 3 variables and does not require any other compass input
 
Dwight Veinot
1974 C&C 35, Alianna
Head of St. Margaret's Bay, NS
 

________________________________

From:cnc-list-bounces at cnc-list.com [mailto:cnc-list-bounces at cnc-list.com] On Behalf Of Dennis C.
Sent: June 29, 2009 10:48 AM
To: CnC-List at cnc-list.com
Subject: { Stu s-List} Nexus system - VMG vs WCV - report
 
As a follow up to a thread on the Nexus sytem and how it handles VMG, I did a quick test yesterday.  At a couple points of sail, while monitoring VMG, I turned off my GPS.  VMG did not change.  Thus VMG as calculated by the Nexus system is based on inputs from the Nexus speed tranducer, compass and masthead unit only.  It is wind-relative VMG.
 
I also played with WCV or waypoint closure velocity.  By switching waypoints on the GPS, the WCV changed.  Thus, WCV is GPS based.
 
This confirmed my original thinking for each of these.
 
Dennis C.
Touche' 35-1 #83
Mandeville , LA
 
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