All you need is rs485 to rs 232 converter and it is ready to be runned on a laptop. It will be sold with a converter and a pigtail. It you search me up un facebook you csn see the sonar on my page. Search for ‘Sogndalstrand Undervannstjeneste’
Thanks for that, looking forward to that. I am offshore at the moment and my latest investment is a Lowrance HDS live echologger and chartplotter with all kinds of scanning options from my boat. It is extremely accurate with higt resolotion. Will be more effective
to use this one to locate pipe and other things with in shallow water area.
The sonar is mounted in the tunnel from where the vertical truster used to be. I actually drilled out the bouancy to have it installed very tight and stabile.
Acc. the blueprint i did this test on behalf of the company that i am working for, Oceaneering and it was not accurate enough for our purpose offshore in the oil industry, but for me private i could like to have one because as long as i was not more than 50-60
meter of senter at 30m depth it was quite stabile. The boat is a nice boat made by a company in sweden called Ockelbo. It is not big, but it is ideally for my purpose. 21feet long and i can have it mobile on a trailer.
Can i ask for wht the quote was? I could get it from UK for approx. 7000 British pound.
Oil and gas are very strict indeed but it’s just a big smoke show since I know from experience that survey positioning is never as accurate as they say it is even with the expensive USBL.
Did you try the water link underwater gps?
If so, how does it compare in accuracy with Blueprint?
I it not within one meter, but that is not what we need eighter. As long as you see related to the map where you are and where you are heading when flying the rov you have the tools to get in right potition i think. It depends how far away you are with the
vessel related to the Rov.
When it comes to DP i am actually playing with that posibility with use of a front eletric motor with GPS, this one can be controlled from my Lowrance HDS live screen. Search for MotorGuide and you will see how you easely can get DP
I’ve also used a Blueprint USBL, I’m still hoping to make it work better (I’m in contact with their support). For now the position error (rough estimate) is around 20m with a distance between the boat and the ROV being between 50 and 200m. It seems to be quite sensitive to noise in the water.
About DP (must be so great to have this !), if you need a high precision GPS, I’ve tested the RTK-GPS from Drotek, it works pretty well ! I use two DP0503 RTK GNSS by Drotek along with two Raspberry Pi and 4G communication. Depending where you want to use it another communication mean would be better.
Thanks for that, but my questions was regarding the Tritech 720im. I just finished the installation of the ping altimeter today without any problem, but find it not very accurate. I can stay 20cm above seabed for several minutes and it read 4-5 meter, and suddenly it drops down to the depth i actually is on. Have not been able to do any calibrations on it and not aware if there i options for it.
Can you @jwalser tell us what to do to make it more accurate? i have several logfiles from today if you want to have something to look at.
Thanks for the suggestion. I asked the supplier if I should modify the speed of sound setting, he said there shouldn’t be any need to touch this. But I’ll try next time as from last time measurements I have a strong impression that the speed of sound is off (part of the error is clearly dependent on the distance and doesn’t look random).
I also came accross this one, looks great ! I chose the Drotek as it is less expensive and I didn’t need the IMU, WiFi, housing etc. as I wanted to use it with a Raspberry Pi.
This is an odd response unless their equipment measures the sound velocity by itself?
I am no positioning experts but I have been working offshore a lot with several types of USBLs and the survey department usually do several SVP (sound velocity probe) dips per week to maintain accuracy.
Since speed of sound is used directly to measure distance underwater, this will influence the accuracy for sure.
The Ping’s minimum range is actually 0.5m, so we don’t expect it to work well at 20cm as you describe. It’s challenging to pick out the depth at that range, unfortunately.