moving entity with entity

i've made an airship that i can walk around on, but i have problems walking around on it when its moveing, for instance sliding of the back when its moving forward, falling through it when its moveing up, i tryed to fix it like this

tmpx=entityx(character)-entityx(airship)
tmpy=entityy(character)-entityy(airship)
tmpz=entityz(character)-entityz(airship)

moveentity airship,asx,asy,asz

positionentity character,entityx(airship)+tmpx,entityy(airship)+tmpy,entityz(airship)+tmpz

this worked fine if my airship only went forward or forward and down slowly, if i went up i would fall through the ship, if i went down to fast and forward i would slide off the back.
i tryed to do entityparent but it kept messing up the coordinates of my character and my camera would go flying of the terrain.

somebody must know a good way to do this
thanks

Apply the movement of the airship also to the character? So, if you move the airship 10 units on the x-axis:

MoveEntity airship,10,0,0

Then you also move the character 10 units on the x-axis:

MoveEntity character,10,0,0

that only works if the character and airship face the same direction though. i want to be able to walk around on the airship

Have a look at the TFormVector() command. IIRC, you can use that command to "TForm" a vector for the spaceship to a vector (in the same direction) for the character. Then you can use TFormedX(), TFormedY() and TFormedZ() to move the character with the spaceship.

thanks i'll try it

Or you could make the player a child of the airship.
This way, if the airship moves, so will the player.

CompleteAirship = CreatePivot()
EntityParent player, CompleteAirship
EntityParent airship, CompleteAirship

This code creates a pivot, makes the airship a child of that pivot and makes the player a child of this pivot.
You can still move the airship and the player separately.

If you want to move the airship AND player: MoveEntity CompleteAirship, x, y, z
Then the airship moves and the player moves with it, direction of the player doesn't make a difference.