On the Knowledge: Grav.
Regarding the Knowledge Grav and the Skills Driver and Flyer. I had the issue come up in my PbP and I think there is an Errata in how these Skills and the Knowledge works according to the Core Rules. Below is my House Rule and the reasoning behind it and why I think this needs to corrected.
Driver handles all ground vehicles and those vehicles that are operated at less than 10 meters above the surface.▮
Flyer handles all air vehicles or anything that gets above 10+ meters above the surface when operated.▮
While the Grav Knowledge does cover operations of Grav vehicles, it only covers the basic of controls and use.▮
The Skill Driver or Flyer represents knowledge of safe operating conditions, laws, codes and regulations covering that type of vehicle operation, and standard emergency procedures for that area of operation be it ground or air based.
Thus Driver-0 (Grav-1) is not the same as Flyer-0 (Grav-1). Dealing with a major malfunction at 10 meters is whole different kettle of fish than it is at 100 meters, this is why there are different Grav based Vehicle Skills.
Yes, this my personal Ruling. I feel that for the reasons I laid out that just because both Driver and Flyer have a Grav Knowledge in them does not make them the same function. I think the rules are wrong, Grav is just the motor that moves the vehicle. That would be like saying because I have knowledge of the internal combustion engine and both cars and planes use IC engines I can drive as well as I fly. Ask any pilot, flying is not, repeat not, driving through the sky, planes function differently than cars do. This is why I am making the ruling I am. Also, why even bother having Grav in Driver and Flyer and instead just add a Grav Skill equal to Driver or Flyer, but only for Grav based vehicles.
Now feel free to argue with my interpretation.

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Oh, and I don't see any reason for there to even be a Grav Knowledge in the Seafarer Skill. How exactly does that work anyway?