It's really quite simple:
1. Identify the ship and turn on the PK.
2. Get an intial range on the target. Send this data to the TDC.
3. Wait some time, and then get another range on the target, and send it to the TDC.
4. Click on the Estimate Target's Speed button. Provided you have good data, the navigator will come back with a speed and course estimate (e.g., "Target plot shows speed 12 knots, course 65 degrees"). Send this data to the TDC.
4. Enter in the AOB and send it to the TDC. Your firing solution is now complete.
Note there are restrictions on getting a good speed estimate. The following are the other new messages that can show up when estimating speed:
- Sir, the range data we have is too old. We need more recent range data!
- Cannot compute speed for the target sir, we need more data! (This appears when you have entered only one range estimate)
- Sir, the data doesn't add up. There must be at least %d seconds between the last 2 range measurements.