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

dwight veinot dwightveinot at hfx.eastlink.ca
Mon Jun 29 10:45:10 EDT 2009

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: {Stus-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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