Use voice chat to connect the crew's jobs
S.O.N.A.R. proximity voice chat is part of the game's built-in cooperation: the launch announcement specifically connects it to piloting, operating stations, firing weapons, repairing leaks, and stopping fires. Your crew needs to share what is happening because those responsibilities are spread around the submarine. A clear report about a contact or damaged compartment is more useful than several people shouting different instructions.
The full release supports one to six players in cooperative play. Some older descriptions still refer to four crew members, but the October 29 launch announcement confirms the larger crew size. Plan your communication around the people actually aboard rather than an outdated four-player limit.
Understand the intercom's place
The developer's FAQ lists proximity chat, an intercom, and emotes among the ways to communicate with friends. That gives you more than one communication tool to learn while sharing station responsibilities.
The official S.O.N.A.R. game page emphasizes communication during fires, flooding, and other equipment problems. Before leaving for separate duties, make sure your crew understands which communication method it intends to use for routine conversation and urgent reports.
The published material does not provide the exact proximity radius, intercom activation sequence, or default push-to-talk key. Check your installed game's prompts and available controls for those details instead of assuming a key from another game will work here.
Make emergency reports easy to act on
A useful communication habit is to include the problem, the location, and who is responding. For example, tell the crew that a compartment is flooding and that you are going to investigate it, rather than announcing only that something is wrong. This is coordination advice grounded in the game's separate navigation, sonar, engineering, and damage-control duties, not a special mechanic or command system.
When someone receives an assignment, a short acknowledgment helps avoid two people leaving an important station for the same repair. Likewise, distinguish a weapons instruction from a report of an onboard fire. These simple habits help a crew use its communication tools without adding unsupported claims about how the audio system behaves.
FAQ
Does S.O.N.A.R. have proximity voice chat?
Yes. The full-release announcement explicitly identifies proximity voice chat as a way to coordinate the submarine's jobs.
Is there an intercom too?
Yes. The developer FAQ lists an intercom alongside proximity chat and emotes. It does not give a complete control sequence for using it.
What is the default voice-chat key or exact range?
Those details are not specified in the supplied official material. Use your current in-game controls and prompts for input assignments; this guide does not assign an unverified key or distance.
How many people can cooperate aboard one submarine?
The launch announcement confirms one to six players. Older four-player descriptions should not override the full-release information.