I'm finally far enough into a game to start researching some of the less straightforward techs, because guns and engines have gotten too expensive. I'm not clear what some of them do. I'm using 4.91.
1) Maintenance Production X SP per annum - first of all, the number in the title and in the description don't match. Second, I initially thought this meant maintenance facilities automatically made X amount of maintenance supplies, but this does not seem to be the case. In fact, supplies are made by devoting construction factories. So, what does this do?
2) Max Tracking Time Bonus vs Missiles - I gather this allows better targeting of missiles relative to speed. But is this for the whole fleet, based on how long the long range sensors have tracked the missiles, or per ship, based on how long the fire control has targeted the missile?
3) So far I've never built a salvage ship. Are the more advanced salvage modules just faster, or is there some other advantage?
Thanks for any help given.