Ranks
Rank 1
Astrodynamics
Increase grav jump range of jump drives by 15%.
Rank 2
Astrodynamics
Reduced fuel cost of jump drives by 15%.
Rank 3
Astrodynamics
Increased grav jump range and reduced fuel cost of jump drives by 30%.
Rank 4
Astrodynamics
Reduced fuel cost of jump drives by 50%.
Challenges
Rank 1: Make 5 grav jumps.
Rank 2: Make 15 grav jumps.
Rank 3: Make 30 grav jumps.