Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-02-2010, 12:29   #1
Registered User

Join Date: Apr 2007
Location: Jupiter FL
Boat: temporarily boatless...
Posts: 723
Strange Symbols, Raymarine Chartplotter

I have a Raymarine 435i. There are two things I just don't understand. First, there is this rectangular grid of little pink birds (no, I'm not making this up), what the heck are those? Second, many of the soundings will have a smaller number to the lower right, usually an 8, but sometimes a 7 or a 9. They can't possibly be other units of measure, because you can't have a 10 foot depth convert to 8 meters or fathoms... Any insights into either of these great mysteries? I've searched the Raymarine literature and the web to no avail, been bothering me for years... pete
__________________

__________________
pete33458 is offline   Reply With Quote
Old 02-02-2010, 13:30   #2
Registered User

Join Date: Jan 2010
Posts: 48
Pink flamingos
__________________

__________________
promax is offline   Reply With Quote
Old 02-02-2010, 14:41   #3
Registered User

Join Date: Apr 2007
Location: Jupiter FL
Boat: temporarily boatless...
Posts: 723
Quote:
Originally Posted by promax View Post
Pink flamingos
They could be pink buzzards, I just want to know why they are there.
__________________
pete33458 is offline   Reply With Quote
Old 02-02-2010, 14:45   #4
Registered User

Join Date: Jan 2010
Posts: 48
I have a raymarine plotter and have never seen those symbols, sorry Possible they represent an obstruction of some sort Compare the area to a paper chart
__________________
promax is offline   Reply With Quote
Old 02-02-2010, 15:42   #5
Registered User
 
Lost Horizons's Avatar

Join Date: Oct 2009
Location: Portage, MI
Boat: Temporary boatless
Posts: 182
These are the features of certain versions of Navionics charts. My Raymarine C80 does not show them, but the iPhone does.

The soundings figures are the decimals and they are actually very accurate numbers. Some areas have different markings than flamingos. My guess is that it defines protected areas, but I don't know for sure.
__________________
Lost Horizons is offline   Reply With Quote
Old 03-02-2010, 13:55   #6
Senior Cruiser
 
jackdale's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Calgary, AB, Canada
Posts: 5,048
Images: 1
Do your pink birds look like this?



If so, they are "Limit of restricted area".

The subscript numbers are likely 1/10 of depths. Is your chart plotter set for metric (SI) depths? Fathoms and feet would always be 5 or less.

Jack
__________________
ISPA Yachtmaster Ocean Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203,204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
jackdale is offline   Reply With Quote
Old 03-02-2010, 14:25   #7
Registered User

Join Date: Apr 2007
Location: Jupiter FL
Boat: temporarily boatless...
Posts: 723
Quote:
Originally Posted by jackdale View Post
Do your pink birds look like this?



If so, they are "Limit of restricted area".

The subscript numbers are likely 1/10 of depths. Is your chart plotter set for metric (SI) depths? Fathoms and feet would always be 5 or less.

Jack
Jack: with respect to the first part, yes, and restricted area makes sense where i normally sail (Florida Keys = coral).

In the second part (also a response to Lost Horizons), I had considered that it might be inches or tenths of feet, EXCEPT...that it would seem to me that if it were tenths of depths, it wouldn't almost always be an 8, but rather, an even distribution of all numbers between 0 and 9. So I don't think this can be the case. pete
__________________
pete33458 is offline   Reply With Quote
Old 03-02-2010, 18:05   #8
Registered User
 
Lost Horizons's Avatar

Join Date: Oct 2009
Location: Portage, MI
Boat: Temporary boatless
Posts: 182
The decimals there do have a strange distribution, but except .8 I have seen other numbers as well. In the following image, which is a spot where the channel from my marina leading to Biscayne Bay ends, the dominating number is .9.

The depth in the area right to the east of the last markers is shown
as 39.

Both NOAA charts and my Raymarine C80 show this spot to be 4 feet deep. My sounder agrees with 4 feet, which limits a little bit my freedom of going in and out of the marina, but it is definitely not 3 feet, I would have known. Perhaps the Navionics people wanted to emphasize that it is indeed no more than 4 feet there? Not 4.4, for example, which would be consistent with simply "4"? Obviously, it is impossible to accurately measure depth everywhere along the cost at 0.1 ft precision, so there mast be some other explanation why they are doing it this way.

As for the pink birds, I looked at them a little more, and it appears that they are lpaced within the US territorial waters.
Attached Thumbnails
Click image for larger version

Name:	IMG_0102.PNG
Views:	505
Size:	21.5 KB
ID:	12993  
__________________
Lost Horizons is offline   Reply With Quote
Old 03-02-2010, 18:33   #9
Obsfucator, Second Class
 
dacust's Avatar

Cruisers Forum Supporter

Join Date: Feb 2008
Location: Southeast USA.
Boat: 1982 Sea Ray SRV360
Posts: 1,743
I had noticed those before and thought I only saw 3,6,9 on charts measured in feet. So I thought it was inches. And 3,6,9 would be the quarter foot increments.

-dan
dacust is offline   Reply With Quote
Old 04-02-2010, 09:23   #10
Registered User

Join Date: Apr 2007
Location: Jupiter FL
Boat: temporarily boatless...
Posts: 723
Well at least other people are seeing this and somewhat confused by it as well!!!! I sent LostHorizons' useful attachment to Raymarine; will keep you posted.
__________________
pete33458 is offline   Reply With Quote
Old 04-02-2010, 09:29   #11
Registered User
 
Lost Horizons's Avatar

Join Date: Oct 2009
Location: Portage, MI
Boat: Temporary boatless
Posts: 182
One more observation: I switched feet to meeters inthe settings, and that "3.9" soundings figure changed to "1.2." Now, 1.2m is almost equal to 3.9 feet. So I think the data on this version is stored in some units that after conversion to a desired system is dispalyed with decimals without being rounded.
__________________
Lost Horizons is offline   Reply With Quote
Old 04-02-2010, 14:12   #12
Registered User

Join Date: Apr 2007
Location: Jupiter FL
Boat: temporarily boatless...
Posts: 723
Here are the answers from Raymarine:

Regarding the little pink birdies:

"The symbols and grid are contained in a cartography layer that cannot be turned off. The grids are marine resources leasing boundaries and the bird symbols denote sanctuary areas."

Regarding the small numbers to the lower right of chart soundings:

"It appears that these subscripts are used in conjunction with units for spot soundings. If you move around the bay, you will find that subscripts other than 9 will be displayed. In the case where depth units are configured to feet, the subscript will report fractional feet. For example a spot sounding shown on the screen as 11 subscript 8 will change to 3 subscript 6 after the display has been configured to meters (i.e. 11.8' is approximately 3.6 meters)."

This latter one leaves me a little unsatisfied; as I said above, it seems to me that if these were truly fractional units, there would be a random distribution of all numbers from 0-9; but this isn't the case on my chartplotter, nor is it the case on Lost Horizons' attached image (where every "fractional" number is a 9...).

Well, at least part of the mystery is laid to rest! pete
__________________

__________________
pete33458 is offline   Reply With Quote
Reply

Tags
chartplotter, raymarine

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
chartplotter/fishfinder, raymarine a65? iscurt Navigation 3 17-03-2009 03:16
Raymarine C70 Chartplotter Mounting amytom Marine Electronics 2 10-10-2008 08:31
Chartplotter & Radar - Garmin or Raymarine Maduro Marine Electronics 15 25-07-2008 03:01
Strange behaviour on Raymarine Track mode with ECS chart plotter zlimmie Navigation 3 10-07-2008 13:56
Interface Raymarine chartplotter to Autopilot tilmonday Marine Electronics 4 18-05-2006 09:16



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:31.


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.