Quick answer
Quick answer
The current Steam listing identifies Professional Ship Simulator as single-player. Online co-op, shared crews and cross-play are not confirmed features.
Read the guideGuide notes
AI traffic is not online co-op
The advertised world contains AI ships and radio interactions. Seeing other vessels or receiving missions does not mean other human players control those ships. There is no verified host/join flow, lobby capacity or shared-save procedure to explain for this title.
Guide notes
If playing with friends is essential
Do not buy this game on the assumption that a future multiplayer mode is guaranteed. Review the current Steam features and any explicit developer announcement. The comparison page explains the separate game Seafarer, whose current store description does advertise co-op for up to four players.
Questions & limits
Questions & limits
What would change this answer
An official mode announcement and clear supported-platform details would justify an update. Community wishes, multiplayer tags on another game and a shared Discord server do not establish playable co-op in Professional Ship Simulator.
Sources
Last checked: 2026-09-13