Questions about example sentences with, and the definition and usage of "Onboard"

A: onboard can often be a way of asking if you will do or are okay with something. For example, "are you still onboard with the camping trip?" meaning "are you still going on the camping trip?". In this case I think it's the question of if they can afford the additional payments. I hope this helps!

A: It means I agree.

A: It means that you willing to do or go with whatever plan was suggested.
A: "What do you think of the business plan?"
B: "I'm on board."

A: It can mean "I'm in agreement" with a particular group/issue/direction.
It refers to being on the same boat/train/plane in which everyone is going together in the same direction or to the same destination.
"not onboard" means that you disagree with or oppose the idea at hand.

A: Are you onboard with this plan?

Get onboard the boat.

A: "콜!" 누군가 "야. 라면을 먹자"라고 말하면 "I'm onboard"라고 말할 수 있어요. 이렇게.

A: I think I would write this a bit differently, but it sounds natural. For clarity, signs like this often use simplified grammar.

A: You have that quote wrong.
That means nothing as written. Sorry.