Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-11-2007, 18:57   #1
Registered User
 
henkmeuzelaar's Avatar

Join Date: Jan 2007
Location: Rocky Mountains & Vanuatu
Boat: Zodiac Ribster 17' "HAV"
Posts: 40
Looking for COG-referenced wind/log instruments

I am considering to replace our 7-yr old Nexus/Comnav depth/speed/wind instruments with something else since the price of replacement sensors and display units keeps going up pretty steeply while none of the better known discount chandleries still appears to carry that line.
.
Since the long axis of the Vanuatu island chain, where we have spent the past 8 seasons, parallels the predominant SE tradewind directions much of our sailing is either very close to the wind or to the jibe. Consequently, we have come to appreciate the convenience of being able to steer apparent wind angles, rather than compass headings, especially during tiring overnight stints at the wheel.
.
If winds and seas are moderate and steady our Scanmar "Autohelm" windvane does most of the work. In recent years, however, the proverbially reliable tradewind belt winds and seas seem to be giving way to increasingly unpredictable wind and wave directions with confused seastates. Whether or not this primarily reflects the increasing turmoil in our aging minds , we clearly have ended up doing more hand-steering, especially at night.
.
With our 5.8' wing keel draft and the stopping effects of the frequently steep waves (due to current against wind and/or overlapping wave directions) the angle between compass heading and COG can easily vary between -5 and +25 degrees. Therefore, we are looking for helm instruments able to continuously integrate wind, log and GPS information, so we can steer the correct apparent wind angles (i.e. between apparent wind direction and COG, rather than between apparent wind direction and vessel centerline) while also fine-tuning the centering of the boom when close-hauled. After all, who cares where the centerline of the boat happens to be pointing when the real direction and speed of the vessel's travel (i.e. the COG) primarily affects the apparent wind (assuming constant direction and speed of the true wind).
.
I am especially eager to find out if any of the mainstream instrument lines now being offered by the discount chandleries enables full integration of wind/log/GPS data without requiring the COG data to be produced by the same brand of GPS but rather to be taken off any NMEA 0183 or 2000 input. For our remote nook of the ocean we are pretty well invested in Garmin GPSmap and Bluechart technology and the last thing I would like to bring into the mix is yet another, hard to verify, source of GPS data.
.
Flying Dutchman
S/V Rivendel II (currently dry-berthed in Port Vila, Vanuatu)
__________________
henkmeuzelaar is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Masthead Wind Instruments Roy M Marine Electronics 19 28-07-2013 09:25
Mounting instruments at helm Biermann Construction, Maintenance & Refit 4 20-01-2007 13:30
A new set of instruments, cheap! Weyalan Marine Electronics 3 07-08-2006 17:33
Alternative to Raymarine instruments claire Marine Electronics 19 14-05-2006 01:01
Musical Instruments on board Tigerlily General Sailing Forum 26 07-04-2006 10:05



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:15.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.