**Estimating your torpedoes' time to impact**
The TDC has a built in Time to Impact feature, but here's how you can doing it manually. When you have your firing solution and shoot your torpedoes, start your stopwatch by pressing T

Then grab your handy calculator, enter the range that you used in your firing solution and divide by 15.4 .This will give you the

**estimated time to impact in seconds**.

Example: you estimated the range to the target as 1400 meters, then divide 1400/15.4 = 94 secs

To change the estimate to minutes and seconds, simply subtract 60 seconds from the total until you are left with a remainder that is less than 60.

Example: Estimated range is 2600m divided by 15.4 is 168 seconds. 168 - 60 = 1 minutes and 68 secs, so subtract another 60 and you have

**2 minutes and 48 seconds**. That's about as fancy as the math gets on this calculation so even Bernard can handle it

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Remember: the time to impact estimate will depend on how accurate you were with your range estimate.

Press R to reset the stopwatch, and to hide it.

FYI: The torpedoes in your Wolfpack U-boat run at 30 knots, which is 15.4 meters per second.