Can I chose to just change may yaw value and keep the speed I'm at or do I have to do both with the command?

You can do one or the other or none of them and still count as resolving the command.

You can also do both with your Nav command and count as resolved.

Is that correct? You can both adjust speed and yaw with one command dial. I thought it was one or the other

Nope, there is nor "or" part of it. So you can have both effects, one effect, and you can spend the dial and choose no effects (no idea why you would but it is an option) which let's you use effects like engine techs

Oh and tokens can be spent and you don't have to change your speed.

Nope, there is nor "or" part of it. So you can have both effects, one effect, and you can spend the dial and choose no effects (no idea why you would but it is an option) which let's you use effects like engine techs

Nope, there is nor "or" part of it. So you can have both effects, one effect, and you can spend the dial and choose no effects (no idea why you would but it is an option) which let's you use effects like engine techs

want to point out you say you have no idea why someone would do that and then proceed to tell everyone why someone would do that...

Not using the effect of the token when you spend it makes sense. . . That enables Engine Techs still. The dial gives you 2 bonuses though which are amazing so not to take one feels wierd. . .

Thank you cleared that up