I'm trying to use the ship selection filters, but I must be doing it wrong. For example, the instructions say to push "N + 7" to select ships with damaged engines. Here's what I'm doing:
1. Push "1" to select control group 1.
2. Push N and 7 at the same time to select damaged engine ships
3. Nothing changes, all the ships in control group 1 are still selected
Someone must have a damaged engine though, because my group speed is given as 15 even though every ship in the group has a min speed of 18