[PSUBS-MAILIST] Underwater Navigation

Wed Sep 4 22:15:46 EDT 2019

 Thanks for the information.
Cliff
    On Wednesday, September 4, 2019, 03:04:38 PM CDT, Øystein Skarholm via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 To start off with the price. for the X150 and X010 package, I paid 7500USD....approx. At first, the system had lots of bugs and issues. I was on their back for a year. The position would jump all over the place due to backscatter signals, especially on the flat sandy seabed and still surface. With new software and firmware, I can now see the rov position directly on google earth map or esri maps. The position is stable and the system seems to be operating well. However, both these systems are intended to be the sub, rov or divers position on the surface. You will not be able to see your position from within the sub. BUT, it may be possible to use 2 of X150 as they are both transponders/transducers to be able to get the relative position from the X150 on the sub onto a laptop onboard the sub. If they have a software to do so is a different question....who knows.FAnother option - this type of equipment is better suited https://www.blueprintsubsea.com/pages/product.php?PN=BP01068 I have very little knowledge about it. 

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ons. 4. sep. 2019 kl. 18:30 skrev Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>:

 This Blueprint Subsea system looks promising.  Can you give some of your experience with the kit?  Also which transponders are you using and what was your cost?  Are the range numbers given at the web site in agreement with your experience.
Cliff
    On Wednesday, September 4, 2019, 09:26:15 AM CDT, Øystein Skarholm via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Check this out for navigation. I myself use the one from Blueprint subsea. 
USBL Blueprint Subsea

Underwater GPS

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ons. 4. sep. 2019 kl. 15:22 skrev Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>:

We need a PSub wis kid to make a DIY version of this kit.
Cliff 

Sent from my iPhone
On Sep 4, 2019, at 12:12 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Cliff,Just got a price on the Subsonus you referenced. Part of the reply is below...   "A kit for the vessel (item code: SUBSONUS-SURFACE-KIT), includes the Subsonus USBL, pole mounting bracket, a GNSS Compass, PoE-Injectors and cables.Provide a boat, a pole, power and a network and you'll have yourself a tracking solution that you could mobilise immediately.This surface kit is US$22,800."Alan

On 1/09/2019, at 1:29 AM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan, an alternative would be to order an off-the-shelf USBL https://en.wikipedia.org/wiki/Short_baseline_acoustic_positioning_system system like Subsonus | Advanced Navigation

    On Saturday, August 31, 2019, 05:54:47 AM CDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 I was looking at GPS receivers for my sub, mainly for estimating my
surface speed & determining my range based on my power consumption.
But it occurred to me that you could make a similar system to GPS for
underwater navigation.
Have 4 buoys placed around your intended dive location that have GPS
receivers & ultrasonic transmitters. With a bit of electronics the submarine 
could locate itself with trilateration ( as in GPS) in relation to the 4 bouys.
The 4 buoys in turn are locating their position off satellites & relaying this
information via the ultrasonic transmitters to the sub. This way the pilot
could use charts to plot where they were & where they had been. 
It wouldn't matter too much if the buoys were blown about or if they moved 
in the current as they would update their position.
It may be helpful for grid searching.
If you wanted to get more serious you could put small motors on the buoys
that automatically held them in position as Minnkota are now doing with
their radio controlled motor.
Or is this already done?
Alan

You bolt this unit to the top of your sub and drop the corresponding tender transponder into the water and  the sub (as well as the tender) knows its submerged GPS location real time.  Tender knows it's GPS location and the surface unit calculates the relative location of the sub then sends the calculated GPS location back to the sub real time.  There are a number of these USBL systems.  For the Psub community, the trick would be to standardize on one that does not cost an arm and a leg.

Cliff

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Øystein Skarholm91369599

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