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the compass alone yes, it will have an issue close to any metallic object, such as wrecks, but the Compass is not used alone in the IMU, it's always compensated with the 3 Axis Gyro.
in an ideal world, i would say even the compass is not needed, if you can calibrate the heading onboard , then just leave the Gyro and Accelerometer predict the heading, but for better accuracy the compass is used.
i do have a 3 magnetometer in my diving computer, and i had never had a single issues with wrecks,
anyway , thanks for encouraging me to get this done quickly and get it to all the diving community soon, as i'm my self a frustrated diver when it comes to find my way back.
Having flown pre-GPS aircraft equipped with Inertial Navigation Systems, Kacem's device makes sense. A small size is paramount to a diver. Seems the power supply to drive the gyros could be an issue too. All doable though with today's technology.
In fact it looks like people are already developing and incorporating nanogyroscope technology. Nanogyroscopic stabilizers in camera phones is one example. Nanogyroscopes that could sense direction along an axis would solve all size and power problems.
Fun stuff. Can't wait to see the finished product Kacem.
for whatever we lose (like a you or a me)
it's always ourselves we find in the sea - e.e. cummings
And if I may modify an aviation quote by an anonymous author: "Diving itself is not inherently dangerous, but it is terribly unforgiving of any carelessness, incapacity, or neglect."
of course the contribution of the automotive, camera stabilization, new Phone generation, virtual reality, motion capture, etc all made the prices to drop down.
On a large pile of smokin' A'a, the most isolated population center on the face of the earth. 2,175 miles to Alaska, 2,390 miles to California; 3,850 miles to Japan; 4,900 miles to China; 5,280 miles to the Philippines.
I refuse to believe that corporations are people until Texas executes one.
"Too often ... people enjoy the comfort of opinion without the discomfort of thought" - Leapfrog
"They are the McDonalds of diver certification. Quick, inexpensive and tasty. Pardon me for saying so, but I also believe it to be a health hazard." - DCBC
"It truly does boil down to motivation ... if you believe something is hard, or unnecessary to learn, you won't learn it ... even if it's completely within your capability" - Bob (Grateful Diver)
correct, the two chipset from Honeywell and Analog devices are the best at this time for this kind of application,
the prices are still high today, : the Honeywell Magnetometer is in the range of 120$ for low volume, and the Accelerometer + the Gyro in one chip from Analog is in the range of 250$ for low volume
add to that a nice CPU like the ARM7, in the range of 40$ for low volume, and an LCD 3-4" a Nokia one at 60$
you see for a nice prototype, I'm not far from the 500$ as a HW BOM only.
of course there is other chipset very cheap like the freescale one.
but i'm a diver my self, and if today we are not that using the scuba scooters that much , it's because the anxiety of not finding our way back.
and for such a way of diving, high speed diving I may say the choice for very accurate sensors is really the first priority to avoid any accumulation of the drift over the time.
anyway, I will consider this topic 6 months from now, I'm more busy by integrating the Kalman filter at this time.
www.desertstar.com Here at Desert Star we build diver homing systems (to find your way to the boat/dive buddy/etc). We also build underwater tracking systems. PM me for ScubaBoard pricing!
www.desertstar.com Here at Desert Star we build diver homing systems (to find your way to the boat/dive buddy/etc). We also build underwater tracking systems. PM me for ScubaBoard pricing!
If you brought an u/w GPS to market you would be killed in the rush. I don't think it needs to be able to do anything more sophisticated than help people get back to their entry point, although if you could add an ability to find u/w waypoints, so much the better.
What would people pay for that? I would have thought anything less than US$500 and you have a queue. Above that, I think they would still sell, but you it won't become de rigeur in the same way that a dive computer has.
One thing I have never understood is why no one has popularised an underwater beacon locator, so that you can find your way back to the ascent line by "pings". I would have thought that would be a cheap and simple innovation that would make a pack of cash for someone.
Good luck bringing it to market - I think the idea has huge potential.
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