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Old 16-03-2021, 21:18   #16
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Re: recording depths with GPS positions for bathymetry

did several projects with remote collection of depths via wifi / gsm.
A combined echo sounder chartplotter with NMEA data output to Ethernet to an omnidirectional Wifi antenna was installed at the tender. On the base ship, the same antenna devices operate in a single network. CPN has a great hydrographic plugin configured by Rasbats https://github.com/Rasbats/survey_pi
Data can be collected in third-party programs such as reefmaster (...), export to mbtiles and used in CPN as a bathymetric map with relief shading.

I wish someone would continue to work on the hydrographic plug-in, he lacks the construction of bathymetry isobaths in real time. And CPN lacks the ability to simultaneously display the position of the base vessel and the tender that collects depths into a plugin
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Old 16-03-2021, 22:29   #17
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Re: recording depths with GPS positions for bathymetry

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Originally Posted by Simi 60 View Post
And how would it do that?
OpenCPN in big boat wheelhouse
Dinghy sounder in dinghy a large distance away.

What am I missing?
OpenCPN runs great on Android tablet, and VDR plugin runs on Android. Issue is you have to get dinghy sounder NMEA output to Android. I do this by taking sounder NMEA output to a wifi broadcaster (TwinYakker). Sonar input plus Android internal GPS, all to VDR recording, which has depths and locations.

Returning to "big boat", you can transfer VDR text file to main computer (eg by micro SD) and then get GPX and XYZ files of depths. GPX can go directly into OpenCPN (XYZ needs Sat2chart/Sasplanet or QGIS).
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Old 17-03-2021, 17:33   #18
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Re: recording depths with GPS positions for bathymetry

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OpenCPN runs great on Android tablet, and VDR plugin runs on Android. Issue is you have to get dinghy sounder NMEA output to Android. I do this by taking sounder NMEA output to a wifi broadcaster (TwinYakker). Sonar input plus Android internal GPS, all to VDR recording, which has depths and locations.

Returning to "big boat", you can transfer VDR text file to main computer (eg by micro SD) and then get GPX and XYZ files of depths. GPX can go directly into OpenCPN (XYZ needs Sat2chart/Sasplanet or QGIS).
Thanks but seems way more involved than what I want.

I am really hoping for a take chip out of sounder or take sounder to PC and plug in approach
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Old 17-03-2021, 22:27   #19
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Re: recording depths with GPS positions for bathymetry

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Thanks but seems way more involved than what I want.

I am really hoping for a take chip out of sounder or take sounder to PC and plug in approach
My wish too.... But it is what it is (for now).
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Old 19-03-2021, 07:34   #20
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Re: recording depths with GPS positions for bathymetry

I am trying to make sense of the process.

If I use the VDR plugin to record all of my incoming NMEA data, then what. I don't understand how to turn that into a coloured bathy chart like Timezero has the ability to create. As it currently stands.

I have some coding abilities and I am interested in trying to create a OpenCPN plugin for this. I just don't know if OpenCPN supports the layering feature such a plugin would require. Look at the videos of Timezero's shading, parts of the chart are still visible. That is what I want.

Rasbat's Survey Pi is nice, but only shows numbers, depth shading, with the ability to change the number of contour lines, colours, etc. That is the key.
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Old 19-03-2021, 08:24   #21
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Re: recording depths with GPS positions for bathymetry

As a good start for the implementation, have a look at: https://www.eye4software.com/download/

The license will be expensive but this is the (professional) tool to look at
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Old 19-03-2021, 09:04   #22
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Re: recording depths with GPS positions for bathymetry

And TimeZero Professional is not. I don't need full survey capabilities. I just need what TZ Pro with the PBG module has. PBG - Personal Bathy Generator.

I used to work for a marine electronics company selling TZ Pro, Olex and other marine electronics gear.

Another similar piece of software is Olex. Which is Linux (CentOS) based, but not opensource. https://olex.no/index/mapping_en.html
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Old 19-03-2021, 09:11   #23
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Re: recording depths with GPS positions for bathymetry

I used QGIS plugins to create contours. But, in the end, I decided I preferred simply displaying the actual depths as numbers.

With a XYZ file of lat/long/depth, one can now use Sat2chart and SASPlanet to print the depths on a satellite image.

I'm not sure which cruisers need/want very detailed bathymetric displays; fisherfolk?
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Old 20-03-2021, 16:54   #24
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Re: recording depths with GPS positions for bathymetry

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.

I have some coding abilities and I am interested in trying to create a OpenCPN plugin for this. I just don't know if OpenCPN supports the layering feature such a plugin would require.
I would have thought georeferenced Kap file overlays would work or at least they would for me
Simply toggle on or off as required as I do now with satellite overlays
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Old 21-03-2021, 02:33   #25
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Re: recording depths with GPS positions for bathymetry

Who will ever trust private bathymetry data? It might be only the one who has taken them. So all the effort is only for private use. Not worth to think more about it...
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Old 21-03-2021, 08:30   #26
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Re: recording depths with GPS positions for bathymetry

I have continued the discussion about contours in this thread:

https://www.cruisersforum.com/forums...-79178-17.html

Mike
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Old 21-03-2021, 10:17   #27
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Re: recording depths with GPS positions for bathymetry

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Who will ever trust private bathymetry data? It might be only the one who has taken them. So all the effort is only for private use. Not worth to think more about it...
That's your choice. Each to their own.

Going into an uncharted area, having some depth info from someone else's sonar scan would be useful for me. Especially if I understand how they came by the data. Of course, with an added safety factor.

I recently placed depth info on our website of the poorly charted entrance to Von Donop Inlet here in BC, where there is a rock one must avoid. That info now shows its actual depth and location, and route around. SOME may find it useful; their prerogative to use it or not.
http://sailing-pelagia.blogspot.com/...m-von.html?m=0
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Old 21-03-2021, 13:42   #28
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Re: recording depths with GPS positions for bathymetry

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That's your choice. Each to their own.

Going into an uncharted area, having some depth info from someone else's sonar scan would be useful for me. Especially if I understand how they came by the data. Of course, with an added safety factor.

I recently placed depth info on our website of the poorly charted entrance to Von Donop Inlet here in BC, where there is a rock one must avoid. That info now shows its actual depth and location, and route around. SOME may find it useful; their prerogative to use it or not.
Sailing Pelagia: That ROCK in the entrance to HA'THAYIM (VON DONOP) MARINE PARK... Detailed info
One good example (which is yours without doubt) does not make generally things better. For the same reason I do not trust the so called Sonarcharts of Navionics.
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Old 21-03-2021, 14:12   #29
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Re: recording depths with GPS positions for bathymetry

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One good example (which is yours without doubt) does not make generally things better. For the same reason I do not trust the so called Sonarcharts of Navionics.
Navionics Sonar charts here in BC seem to simply be interpolations of existing official chart data, and are mostly "fantasy". Real garbage.

Where sonarcharts based on user input do exist, one has no information regarding how the data were collected, by how many users, the tidal and transducer ofsets etc. (At least, I haven't seen this info.) So yes, without key info, wise to not trust.

PS Thanks for compliment.
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