Normal Space Navigation
Normal Space Navigation is about navigation in normal space. This is based on classic rocketscience and astrophysics, sometimes also called astrogation. Advanced propulsion technology may not need to rely on classic navigation but it is necessary for safety purposes.
As space is vast it requires a lot of energy or fuel to travel from point A to point B. In order to reduce fuel consumption understanding and using astrophysics is a required skill in space navigation. Needless to say, this applies to low propulsion technology up to fusion and fission propulsion. Higher propulsion technology are less dependent or sensitive about fuel and may fly as they wish.
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