Thanks for the clarification. I was thinking more about GPS position being relayed to the outside world (not so much their own navigation) in terms of the rescuers being able to locate them. But I see this isn't possible from your information.Vanadium 50 said:GPS odes not work on submerged vessels. There are other navigation methods. (And people were able to suvvessfully navigate ships before GPS - honest!)
Not suggesting anyone could swim to that depth or any Hollywood connotations. And it's not just the depth it's the area. Let's stick to the original question about locating it and EM degradation.Vanadium 50 said:"Rescuing" a disabled submarine is more Hollywood than reality. It's happened a handful of times, like the USS Squalus. This was in the 30's and amazingly more than half the crew survived.
If this is about the Titanic submersible, the problem isn't that we don't know where it is. The problem is that we know where it is. It's in 2-1/2 miles of water. Now what do we do? Can you swim 2-1/2 miles? On one breath?
EM is useless underwater, so scanning sonar is the best bet for finding the lost sub. If there were an attack sub in the area, they could likely search the bottom with their scanning sonar, although I have no idea what kind of resolution they might have with that system. The Seawolf class subs would be able to go down to 490m max, so that's still a long way from the bottom. I also don't know how good their scanning sonar resolution is when looking way down below the sub like that.RobbyQ said:Let's stick to the original question about locating it and EM degradation.
Electromagnetic absorption in the ocean refers to the process by which electromagnetic waves, such as light and radio waves, are absorbed by water molecules and other substances in the ocean. This absorption results in the attenuation of the waves' intensity as they penetrate deeper into the water.
The wavelength of electromagnetic waves significantly affects their absorption in the ocean. Shorter wavelengths, such as ultraviolet and visible light, are absorbed more quickly and do not penetrate deeply. Longer wavelengths, such as radio waves, can penetrate further but are still subject to absorption depending on their frequency and the water's properties.
Understanding electromagnetic absorption in the ocean is crucial for underwater communication because it determines the optimal frequencies for transmitting signals. High absorption rates at certain frequencies can limit the range and effectiveness of communication systems, making it essential to choose frequencies that minimize absorption and maximize signal penetration.
Several factors influence the rate of electromagnetic absorption in the ocean, including the salinity, temperature, and depth of the water, as well as the presence of dissolved substances and particles. These factors can alter the water's electrical conductivity and dielectric properties, affecting how electromagnetic waves are absorbed.
Electromagnetic absorption can impact marine life by affecting the penetration of sunlight, which is essential for photosynthesis in marine plants and algae. It also influences the design and deployment of oceanographic instruments, such as sonar and remote sensing devices, which rely on the propagation of electromagnetic waves to collect data and monitor ocean conditions.