Notices
Marine Electronics Forum

Garmin 741xs Max Speed

Old 06-25-2014, 08:06 PM
  #1  
Junior Member
Thread Starter
 
Join Date: Mar 2009
Posts: 8
Default Garmin 741xs Max Speed

Got a new Pathfinder 2300 HPS and was trying to figure out my max speed. My Garmin 741xs has max speed recorded as 63.1 mph, but when I downloaded my track into homeport it is saying my max speed is 68 mph. Anyone know why the difference?


I guess I should have watched it, but at that speed I find it best to keep my eyes on the water.
Attached Images   
tx_magnum is offline  
Old 06-26-2014, 04:43 AM
  #2  
Member
 
Join Date: Oct 2006
Location: Naples FL.
Posts: 39
Default

Max speed is your fastest speed recorded during the trip even if you hit that for just a second. if you read the other info you only hit it for 8 seconds you may have had no head wind and a flatter surface for that duration
Sunburnt is offline  
Old 06-26-2014, 04:50 AM
  #3  
Senior MemberCaptains Club Member
 
Join Date: Dec 2007
Location: PBG, FL
Posts: 8,933
Default

it is kind of weird. could have something to do with the antenna reading and getting speed.
bradv is offline  
Old 06-26-2014, 09:49 AM
  #4  
Joe
Senior MemberCaptains Club Member
 
Join Date: Mar 2001
Location: Mt Pleasant, SC
Posts: 16,269
Default

Well, I wouldn't think you went from 58-68-60 in span of 18 seconds.

I've seen my Garmin tracks state these types of anomalies (all the way back to a Garmin 2006!) just like this and always took it as GPS error.
Joe is offline  
Old 06-26-2014, 10:26 AM
  #5  
Senior Member
 
Join Date: Sep 2007
Location: Deltona FL, Penrod KY
Posts: 2,097
Default

That's an easy one.

68-63.1= 4.9 is the difference
rdmallory is offline  
Old 06-26-2014, 11:35 AM
  #6  
Senior MemberCaptains Club Member
 
Join Date: Feb 2005
Location: Falmouth, MA
Posts: 5,714
Default

highly doubt it is 'gps error'. i think it is much more likely rounding error that occurs when the unit chops things up into legs and has to round off distances and times. I would think this is why one is reported to 0.0mph and the other just to the nearest whole mph. still doesn't make a lot of sense as they should pay more attention to significant digits but I'm guessing that's just it--rounding errors.

pay attention to the 63.1 and consider leg speed a rough estimate.
chainsaw42 is offline  

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 On
Refbacks are Off


Thread Tools
Search this Thread