Speed of sound
- Sound now travels through the world instead of playing instantly. Distant effects now respect the speed of sound, so destroyer deck-gun reports and torpedo impacts reach you after a realistic delay based on their distance. You may see a distant gun flash and get the impact before you hear the shot... speed of sound above water: 343 m/s, below water 1500 m/s.
- This means you may see a distant gun flash or torpedo impact before its sound arrives. Long-range combat should now feel more physical, spacious, and authentic.

Combat and Sound
- Destroyer deck guns now fire at a more historically accurate cadence, with a slightly slower rate of fire and occasional spotting pauses.
Map Plotting
- Hold Shift while drawing or editing a line to lock its angle, allowing you to change only its length.
- Hold Alt while clicking a map annotation to duplicate it.
- Compass circles now have resize handles in all four directions instead of only on the right.
Performance and Stability
- Improved periscope frame rates, particularly while panning with the arrow buttons or keyboard.
- Optimized TDC dial interactions to prevent clicks from causing hitches and frame drops.
- Completed a large internal refactor targeting memory issues that could cause crashes during longer sessions.
Visual Fixes
- Fixed water shimmer effects not turning together with your submarine.
Convoys and Tutorials
- Manually disengaging from a visible convoy now prevents it from immediately auto-engaging again. (Playtest only)
- Clarified why the Position Keeper is inactive at a range of 9999 in the advanced tutorial.
