If the target doesn’t displace much volume (i.e. Is light or going slow) there is no wake. Also, when most of the volume is deeper under water, there will be no wake (but the increased drag will result in a more audible drone, especially under water).
The scary thing about naval drones is sleeper drones can be much more effective because you can use the current to your advantage. And that’s before you even start toying with ballast.
On land, you would have to have a way to leave a sleeping drone in place behind lines, at sea you can just seed the waters if you’ve the supply.
Small targets are incredibly hard to see, it’s usually easier to see the wake rather than the unit itself. Even more so at night.
If the target doesn’t displace much volume (i.e. Is light or going slow) there is no wake. Also, when most of the volume is deeper under water, there will be no wake (but the increased drag will result in a more audible drone, especially under water).
The scary thing about naval drones is sleeper drones can be much more effective because you can use the current to your advantage. And that’s before you even start toying with ballast.
On land, you would have to have a way to leave a sleeping drone in place behind lines, at sea you can just seed the waters if you’ve the supply.