Comments on: Underwater GPS (sorta)

By: Divergps

Divergps — Mon, 09 Nov 2009 09:43:40 +0000

The photo on this topic is one that I took a few years back when describing my original deploy and recover method. I’ve been using a new adaptation of the method…can be seen on Youtube by searching, “underwater gps”. *This method is designed to be very low cost and to eliminate the need to tow cumbersome equipment.

By: Chuck

Chuck — Thu, 05 Nov 2009 17:04:31 +0000

Sound Ocean Systems, Inc in Redmond, WA has a handheld diver GPS unit. Originally developed for covert military diving, it has been successfully applied to commercial and recreational diving. Check out the Sound Ocean Systems website when you get an opportunity.

By: DFWRescue

DFWRescue — Fri, 11 Sep 2009 00:32:52 +0000

You have to open your mind, you take a GMRS/GPS two way radio make an enclosure and put one on the boat. You take a reading before you get in the water from your anchored boat. Or if you are just a diver you take your boat reading for interesting stuff to revisit or emergencies. So you have a problem you are in a forgein country and like it has happened so times the don’t do an accurate dive count and you and your buddy surface, no boat. Well rescue is going to monitor all radio channels and go to the last place the boat was. So know you can send out emergency radio calls stay in the area the boat was and comminucate with rescue boats and aircraft. The radio options allow you to communicate and track others also presetup, that helps solve some of the issues of missing divers if they have made it to the surface or close to the surface. I would imagine soon they would put in a ping, user activated to help again rescue find you. Yeah bad idea, but I will spend 1,000.00 on something to save my life.

By: Divergps

Divergps — Tue, 11 Aug 2009 00:04:22 +0000

…lot’s of speculation about the topic. I’m the author and have been using this and similar methods for about 10 years at moderate depths. It is often assumed that the housing drifts a great distance from the diver, rendering the “mark” useless…not so. The diver controls the line deployment…even in current, hasn’t been much of an issue. Recently I’ve been towing a dive flag that has the ability to deploy and recover the gps unit…it’s just like pulling a flag…no more complex. One advantage of the methods I use is that the diver works with a small diameter line, not a data cable / floating antenna. My goal is to keep the equipment from dominating the dive. Also…many divers will not “get” the need for gps because they do not dive frequently enough to make it worthwhile. This is intended for researchers, public safety divers, law enforcement teams, and the more avid divers that live near frequently visited sites. Aside from marking points, a constant awareness of the anchor position is maintained.

By: albert ramos

albert ramos — Thu, 30 Apr 2009 14:02:37 +0000

I will like to know were to get the hausing or how to bulder it.

By: Rocknroll

Rocknroll — Wed, 25 Mar 2009 13:54:25 +0000

I never tried gps underwater but if the signal makes it underwater to xx depth it probably makes it deeper. just get more battery power and a stronger antenna on the gps unit. Or just hack into the satellite downlink and boost the power to microwave strength and you can reach 100 foot, but dont get the boat in the way of the signal as it will melt. :-)

By: mgd

mgd — Fri, 30 Jan 2009 15:40:45 +0000

All great ideas, this last one is excellent but to much stuff to do and not immediately available, like going to the store and buying a GPS.

How about this, similar to last idea.

If up put a mark at the starting point (a transmitter) and rig the GPS show this point as a marker on the GPS,.

So you start your dive with a top side riding of you area , activate the transmitter on the Boat, beach etc.

It should track you position with relation to the transmitter. Yes? Maybe? I don’t know. Just and idea.

By: underwatergps

underwatergps — Sat, 18 Oct 2008 14:00:26 +0000

It really could revolutionize underwater archaeology.

By: Spudz76

Spudz76 — Tue, 08 Apr 2008 00:38:55 +0000

Why not use three or more buoys randomly placed on the surface, each with their own GPS and a transponder to do “LPS” based on the buoy positions. Think of the buoys as being local GPS satellites themselves, on different frequency that will penetrate hundreds of feet of water easily. They could then report back to the main buoy node connected to the dive boat which would report the location information as calculated by all the differential signal timing information – exactly like GPS does it globally – and offset the known GPS surface points by the relative distances from each buoy location.

Eventually dive clubs could install semipermanent buoys in popular areas for public use. Call it “DPS” (dive positioning…)

By: eco diver

eco diver — Thu, 27 Mar 2008 00:53:45 +0000

As you can see someone is already making an underwater gps. The main reason I know of using this is for underwater surveying.

The comment about the accuracy of gps's is wrong. I average 10ft (3 meters) when in waas mode. This varies on coverage too. This is with a garmin fortrex 101.

By: Tom

Tom — Sat, 22 Mar 2008 03:35:46 +0000

As a diver who isn’t perfect, this sounds really good to me also.

It might also be good for marking spots to which you hope to return in the future.

By: DiveMichigan

DiveMichigan — Thu, 20 Mar 2008 22:30:30 +0000

I have used this for years as a diver. I am working on getting the antenna and a calculation for the error on the floating antenna based on the diver depth. I’ll let you know once I have it figured out.

Happy diving…

By: cde

cde — Sun, 16 Mar 2008 16:01:48 +0000

Just to note, gps is accurate to 50ft/15meters. So a tethered antenna surfacing 60′ from your point wouldn’t matter much.

By: JoÃ£o Silva

JoÃ£o Silva — Fri, 14 Mar 2008 17:06:00 +0000

Managing the required line?

Nobody heard about http://www.diverite.com/products/catalog/reels reels?

By: Ackphlat

Ackphlat — Fri, 14 Mar 2008 15:57:42 +0000

LOL, now underwear GPS is something I can see many uses for! For a shallow dive I suppose it would prevent going to the surface to mark a waypoint but no way will it work on a deeper dive in a stiff current for several reasons. One, the current will pull the device off the mark so if you are at 80′ the device may surface 60′ upstream of your location. If you tried you could not make it surface directly overhead. Two, no way am I dealing with 200′ of line at 100′ with a current. The 15′ on my Mares is enough to deal with. Three, God invented compasses for open water dives. For points of interest, I do know where I am without a GPS. Now start working on the underwater sonar and the underwear GPS!