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20-05-2014, 19:44
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#1
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Registered User
Join Date: Mar 2010
Posts: 236
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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?
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20-05-2014, 20:33
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#2
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Registered User
Join Date: Aug 2012
Posts: 353
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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 .
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25-05-2014, 05:10
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#3
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Registered User
Join Date: Apr 2012
Posts: 130
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Re: GPS + Sounder = Bottom Contour?
Raymarine and probably others already have this feature.
Jack
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25-05-2014, 05:34
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#4
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Registered User
Join Date: Jun 2009
Location: Live aboard. Gold Coast QLD
Boat: Nauticat 44
Posts: 31
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Re: GPS + Sounder = Bottom Contour?
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25-05-2014, 06:21
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#5
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Registered User
Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,110
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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.
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25-05-2014, 06:47
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#6
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Registered User
Join Date: Dec 2010
Location: Houston, TX
Boat: Beneteau 461 47'
Posts: 927
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Re: GPS + Sounder = Bottom Contour?
Quote:
Originally Posted by colemj
also do not know of a Raymarine or other device that does what the OP is asking about.
Mark
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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."
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25-05-2014, 08:48
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#7
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Registered User
Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,110
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Re: GPS + Sounder = Bottom Contour?
Quote:
Originally Posted by Cavalier
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.
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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.
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25-05-2014, 08:57
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#8
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Registered User
Join Date: Dec 2010
Location: Houston, TX
Boat: Beneteau 461 47'
Posts: 927
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Re: GPS + Sounder = Bottom Contour?
Quote:
Originally Posted by colemj
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
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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."
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25-05-2014, 09:16
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#9
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Registered User
Join Date: May 2009
Location: Lorient, Brittany, France
Boat: Gib'Sea 302, 30' - Hydra
Posts: 1,245
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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
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25-05-2014, 09:29
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#10
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Registered User
Join Date: Apr 2012
Location: Florida
Boat: Seawind 1000xl
Posts: 2,592
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Re: GPS + Sounder = Bottom Contour?
Quote:
Originally Posted by F51
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? 
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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.
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25-05-2014, 10:08
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#11
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Registered User
Join Date: Oct 2005
Location: Cruising NC, FL, Bahamas, TCI & VIs
Boat: 1964 Pearson Ariel 'Faith' / Pearson 424, sv Emerald Tide
Posts: 1,531
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Re: GPS + Sounder = Bottom Contour?
Quote:
Originally Posted by F51
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? 
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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.....
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26-05-2014, 14:35
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#12
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Registered User
Join Date: Apr 2012
Location: Florida
Boat: Seawind 1000xl
Posts: 2,592
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Re: GPS + Sounder = Bottom Contour?
Quote:
Originally Posted by s/v 'Faith'
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.....
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It would be nice to know real time about all the drunks in cigarette boats speeding on the ICW.
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26-05-2014, 14:49
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#13
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Registered User
Join Date: Dec 2010
Location: Houston, TX
Boat: Beneteau 461 47'
Posts: 927
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Re: GPS + Sounder = Bottom Contour?
Quote:
Originally Posted by tomfl
It would be nice to know real time about all the drunks in cigarette boats speeding on the ICW. 
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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."
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