For the fact that Subnautica is an exploring game, underwater. It does seem a bit overpowered with a sonar, sure it might be a good idea to keep it in the cyclops, but not a hand-held device, that is taking it a bit too far.
You know what would be really cool? An extremely large variety of "base-building-stuff" for example a big hangar where you can park multiple submarines, 2 or three maybe.
And the ability to kill things >:D
Cuz we all know that k…