Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 20-05-2014, 19:44   #1
F51
Registered User

Join Date: Mar 2010
Posts: 235
Images: 5
GPS + Sounder = Bottom Contour?

Wouldn't it be nice to combine a GPS and Sounder? Then you could go out in the dinghy and map the bottom contour to find the deepest channel across a bar. Come back to the boat and dump the data into the plotter to have a route around the obstacles/high spots. Am I crazy or what?
__________________

__________________
F51 is offline   Reply With Quote
Old 20-05-2014, 20:33   #2
Registered User

Join Date: Aug 2012
Posts: 337
Re: GPS + Sounder = Bottom Contour?

Not crazy, but maybe a little more than needed. I use a simple hand held depth sounder to scout about. Locate reference markers etc .
__________________

__________________
brantleychuck is offline   Reply With Quote
Old 25-05-2014, 05:10   #3
Registered User

Join Date: Apr 2012
Posts: 59
Re: GPS + Sounder = Bottom Contour?

Raymarine and probably others already have this feature.
Jack
__________________
BocaIII is offline   Reply With Quote
Old 25-05-2014, 05:34   #4
Registered User
 
marting's Avatar

Join Date: Jun 2009
Location: Live aboard. Gold Coast QLD
Boat: Nauticat 44
Posts: 31
Images: 6
Re: GPS + Sounder = Bottom Contour?

Navionics Sonar Charts
SonarCharts™ | Navionics
__________________
Martin & Judy
Archer (Nauticat 44)
Melbourne Australia http://martjudy.net/blog
marting is offline   Reply With Quote
Old 25-05-2014, 06:21   #5
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: GPS + Sounder = Bottom Contour?

We have a handheld depth sounder and a DCS handheld VHF with GPS. When I want to scout a channel or reef or other, I just go out in the dinghy, find the points I want with the depthsounder, and use the DSC "Position Report" feature to send waypoints back to the ship's chartplotter. When I return to the ship, the chartplotter has the path of waypoints all plotted out and ready to use.

I don't think the OP is talking about charts with depths marked on them. He is talking about those areas that either change in time frequently, or are remote/small enough to not have been surveyed for general navigation use. I also do not know of a Raymarine or other device that does what the OP is asking about.

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 25-05-2014, 06:47   #6
Head in a locker
 
Cavalier's Avatar

Cruisers Forum Supporter

Join Date: Dec 2010
Location: Houston, TX
Boat: Beneteau 461 47'
Posts: 879
Images: 1
Re: GPS + Sounder = Bottom Contour?

Quote:
Originally Posted by colemj View Post
also do not know of a Raymarine or other device that does what the OP is asking about.
Mark


Comes up as part of the community layer on Navionics


http://www.navionics.com/en/webapp

..zoom right in and click the community soundings button. It shows higher resolution depth soundings and contours which are the computed average taken from people's depth sounders and chartplotters as they've passed over the area. When they connect their CF card for updates, then depth history with positions is uploaded back to Navionics server and interpolated.
__________________
"By day the hot sun fermented us; and we were dizzied by the beating wind. At night we were stained by dew, and shamed into pettiness by the innumerable silences of stars."
Cavalier is online now   Reply With Quote
Old 25-05-2014, 08:48   #7
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: GPS + Sounder = Bottom Contour?

Quote:
Originally Posted by Cavalier View Post
Comes up as part of the community layer on Navionics


WebApp | Navionics

..zoom right in and click the community soundings button. It shows higher resolution depth soundings and contours which are the computed average taken from people's depth sounders and chartplotters as they've passed over the area. When they connect their CF card for updates, then depth history with positions is uploaded back to Navionics server and interpolated.
Ah yes, but that would require an entire chartplotter setup in the dinghy! Not to mention needing to wait for a long time after taking readings to be able to use them. I understood the OP as wanting something small and portable and immediate.

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 25-05-2014, 08:57   #8
Head in a locker
 
Cavalier's Avatar

Cruisers Forum Supporter

Join Date: Dec 2010
Location: Houston, TX
Boat: Beneteau 461 47'
Posts: 879
Images: 1
Re: GPS + Sounder = Bottom Contour?

Quote:
Originally Posted by colemj View Post
Ah yes, but that would require an entire chartplotter setup in the dinghy! Not to mention needing to wait for a long time after taking readings to be able to use them. I understood the OP as wanting something small and portable and immediate.





Mark


OP wants the moon on a stick!
__________________
"By day the hot sun fermented us; and we were dizzied by the beating wind. At night we were stained by dew, and shamed into pettiness by the innumerable silences of stars."
Cavalier is online now   Reply With Quote
Old 25-05-2014, 09:16   #9
Registered User
 
Hydra's Avatar

Join Date: May 2009
Location: Lorient, Brittany, France
Boat: Gib'Sea 302, 30' - Hydra
Posts: 1,229
Re: GPS + Sounder = Bottom Contour?

In many areas, when you want to use a sounding some time after taking it, you have to correct it for swell and tide.

Correcting for swell just means sounding in a few throughs and on a few crests, then taking the average. But correcting for tide means you have a good knowledge of the tide curve in the area. And the tide often deviates from the rule of twelfths in shallow inlets (don't ask how I know).

Alain
__________________
Hydra is offline   Reply With Quote
Old 25-05-2014, 09:29   #10
Registered User
 
tomfl's Avatar

Join Date: Apr 2012
Location: Florida
Boat: Seawind 1000xl
Posts: 1,959
Images: 10
Re: GPS + Sounder = Bottom Contour?

Quote:
Originally Posted by F51 View Post
Wouldn't it be nice to combine a GPS and Sounder? Then you could go out in the dinghy and map the bottom contour to find the deepest channel across a bar. Come back to the boat and dump the data into the plotter to have a route around the obstacles/high spots. Am I crazy or what?
If I understand your post you might consider getting something like a kayak fish finder.

Not saying this is the best one, just one that seems to get OK reviews from the guys that fish from kayaks.

Fish Finder

Just attach it to the dinghy, and when you get back to the boat take the fish finder to the helm and use the cookie crumbs to guide your big boat.

The fish finder I linked to is fairly new but they keep bringing new ones out every couple of weeks with more features at a lower price. If you do a web search for "fish finder kayak gps review" you can find the one that best suits your needs. It will also function as a redundant GPS on your big boat.

Or not.
__________________
tomfl is offline   Reply With Quote
Old 25-05-2014, 10:08   #11
Senior Cruiser

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Cruising NC, FL, Bahamas, TCI & VIs
Boat: 1964 Pearson Ariel 'Faith' / Pearson 424, sv Emerald Tide
Posts: 1,531
Re: GPS + Sounder = Bottom Contour?

Quote:
Originally Posted by F51 View Post
Wouldn't it be nice to combine a GPS and Sounder? Then you could go out in the dinghy and map the bottom contour to find the deepest channel across a bar. Come back to the boat and dump the data into the plotter to have a route around the obstacles/high spots. Am I crazy or what?
Not at all. If Garmin came out with such a unit, they could interface it with some kind of a crowd sourced app (like active captain) and the waters we sail would be constantly surveyed!

Imagine running the ICW with near real time data.....
__________________
s/v 'Faith' is offline   Reply With Quote
Old 26-05-2014, 14:35   #12
Registered User
 
tomfl's Avatar

Join Date: Apr 2012
Location: Florida
Boat: Seawind 1000xl
Posts: 1,959
Images: 10
Re: GPS + Sounder = Bottom Contour?

Quote:
Originally Posted by s/v 'Faith' View Post
Not at all. If Garmin came out with such a unit, they could interface it with some kind of a crowd sourced app (like active captain) and the waters we sail would be constantly surveyed!

Imagine running the ICW with near real time data.....
It would be nice to know real time about all the drunks in cigarette boats speeding on the ICW.
__________________
tomfl is offline   Reply With Quote
Old 26-05-2014, 14:49   #13
Head in a locker
 
Cavalier's Avatar

Cruisers Forum Supporter

Join Date: Dec 2010
Location: Houston, TX
Boat: Beneteau 461 47'
Posts: 879
Images: 1
Re: GPS + Sounder = Bottom Contour?

Quote:
Originally Posted by tomfl View Post
It would be nice to know real time about all the drunks in cigarette boats speeding on the ICW.


that'll be the "intoxicated captain" plugin!
__________________

__________________
"By day the hot sun fermented us; and we were dizzied by the beating wind. At night we were stained by dew, and shamed into pettiness by the innumerable silences of stars."
Cavalier is online now   Reply With Quote
Reply

Tags
gps

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
Any Contour 30 or 34 Tri Owners Out there? awsmits Multihull Sailboats 2 03-02-2015 18:10
Trimaran Contour 50, Nootka 50 or Hammerhead 54? freetime Multihull Sailboats 22 25-09-2014 13:54
For Sale: 1998 Contour 34 SC trimaran w/trailer 2mdsailors Classifieds Archive 0 14-07-2012 10:04
For Sale: Contour 34 Trimaran - Northern California HapaPops Classifieds Archive 7 23-03-2012 13:07
Contour 30 windhorze Multihull Sailboats 3 22-09-2011 06:24



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:22.


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.