Reply
 
Thread Tools Search this Thread
 
Old 13 November 2013, 13:19   #11
Member
 
Country: UK - England
Town: Cambs
Make: Scorpion
Length: 8m +
Engine: 225 Opti
Join Date: Sep 2010
Posts: 356
I've got a plastimo 105 but slightly offset, which doesn't make too much of a difference to be honest. Staggeringly accurate compared to chartplotter compass all the way round the rose.
__________________

__________________
Portholme is offline   Reply With Quote
Old 14 November 2013, 17:35   #12
Member
 
Join Date: Jan 2013
Posts: 195
Portholme
You say the compass is "staggeringly accurate' compared to chart plotter.

How do you know, what are you comparing it to?

Sent from my HTC One X using Rib.net
__________________

__________________
j.i.wilson is offline   Reply With Quote
Old 14 November 2013, 18:45   #13
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,924
RIBase
He'll mean that it is accurate at every point (knowing this by comparing it to the GPS) - it's in how you read it
__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Old 15 November 2013, 02:47   #14
Member
 
Join Date: Jan 2013
Posts: 195
Oh, yes, I see what you mean.

In which case he must have his chart plotter set to magnetic north.

Still wonder what 'staggeringly accurate" means.

Sent from my HTC One X using Rib.net
__________________
j.i.wilson is offline   Reply With Quote
Old 15 November 2013, 02:59   #15
Member
 
Country: UK - England
Town: Cambs
Make: Scorpion
Length: 8m +
Engine: 225 Opti
Join Date: Sep 2010
Posts: 356
Probably not a great phrase to have used. It's within two or three degrees all the way round the compass rose, usually there's quite a variation as metal work gets in between you and north but this one seems not to suffer.
__________________
Portholme is offline   Reply With Quote
Old 15 November 2013, 04:25   #16
Member
 
Country: UK - England
Town: Surrey
Boat name: Fugly & Rokraider 1
Make: Pac 22 & Porter 6.5
Length: 6m +
Engine: Ford 250 & jet,DT140
Join Date: Jun 2008
Posts: 681
I am looking at fitting a compass on the Pac, but am wondering whether it will work with a rear console and a bloody great iron engine in front of it, albeit approx 4' below the compass?
__________________
Rokraider is offline   Reply With Quote
Old 15 November 2013, 04:39   #17
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,924
RIBase
Quote:
Originally Posted by j.i.wilson View Post
In which case he must have his chart plotter set to magnetic north.
Or be able to add and subtract. He didn't say that it had the same reading as the plotter - just that accuracy was good compared to it.
__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Old 15 November 2013, 16:04   #18
Member
 
Join Date: Jan 2013
Posts: 195
Now this is where my statiticians background is going to show, along with my pedantism.....

Accuracy is the nearness to the right answer, hence the application of the correction is required...

Precision is the spread of the measurements regardless of the right answer, hence the correction would not be required.

I know, i know, but I used to make a living knowing this stuff.

Sent from my HTC One X using Rib.net
__________________
j.i.wilson is offline   Reply With Quote
Old 15 November 2013, 16:13   #19
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,924
RIBase
Quote:
Originally Posted by j.i.wilson View Post
Now this is where my statiticians background is going to show, along with my pedantism.....
Nah, that was showing waaaaaay back - I just wanted you to 'fess up!

__________________

__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 01:13.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.