UBOAT Calculator

Intercept Course Calculator

Contact course is absolute, not relative bearing. Eg North = 0, South = 180. Bearing to Uboat is relative.
To arrive early, insert a slower Uboat speed than you intend to travel but use the same intercept angle.
Draw intercept line starting from target, then to Uboat, then to calculated angle. Adjust for direction of travel on inside angle.

Please enter all values.

AOB & Speed at Observed Angle Calculator

Note: This calculator still uses the old periscope markings from before the game was updated. Results may not be accurate, but you can still try out the tool. The formulae will be updated in the future.

Use the angle markers on the bottom of the periscope to measure the angular length of the ship.
You can use a stopwatch to time the duration of the ship to traverse its own length at the observed angle to determine its speed.

Please enter required values to determine AOB.

Please enter all values to determine speed.

Mirror ↔ Flip ↕

Ship Distance Calculator

Note: This calculator is using the old periscope markings from before the game was updated. Results may not be accurate, but you can still try out the tool.

Use the 1/32° tick markers on the side of the periscope to measure the height of the masts from sea level to the top mast.

Switch to old periscope

Please enter both values.

Multiple Target Synchronised Detonation Calculator

• All values must be accurate at the time of firing the first torpedo (and it won't necessarily be at Target 1, depending on the solution). Do not change them after you begin.
• Remain stationary until you have fired all the necessary torpedoes.
• There may be some small inaccuracies at sharp angles, as this currently doesn't account for torpedo gyro and the limited firing arcs of the sub itself. Nor is there any compensation for stern vs bow shots.
• If you enter values for a target that cannot be solved with the same detonation time as the other targets, it will be excluded from the results. You can try changing torpedo speeds to fix it, otherwise reposition or choose a different target.
• Depending on your settings, TDC management, whether you lock onto targets, and difficulty level you may need to manually update distance & AOB before firing on targets 2-5. I have included the expected target distance & AOB to use at the time of firing just in case you need it.
• If you are measuring distances from the map, there is ~99m margin of error once distances go beyond 1000m/1km due to the game rounding values to one decimal place. If you wish to be more precise, use the Ship Distance Calculator on this page, or the stadimeter in the game.
  Or, use the compass:
  • Draw a circle from your sub to within 1000m of the target, trying to make it as close to an exact km distance as possible.
  • Then draw a circle from the target until it touches the first circle.
  • Add the two radii values together and you should have a pretty accurate distance.

Pro tip: It's a lot easier if you pause and measure them all right before you fire the first torpedo.

Please first enter all values for each target that requires a solution.

Speed from Bearing & Distance Calculator

Enter 2 visual bearings of your target, the distance of the target at each bearing, and the elapsed time between bearings to estimate the target ship speed.
You can do it whilst remaining stationary, or you can do it while moving, but you must maintain a constant course to make the calculations work.

• If you are moving, not only will you need to maintain a constant course, you will need to know how far you have moved between bearing readings. You can use the map to measure it (mark your position when taking bearings), or you can use the Distance Travelled at Speed Calculator above.

Please enter values for bearings, distances and time.