Game Maker Spaceship Engine Emdrive

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I'm making a top-down spaceship tactics game, and I'm struggling with a basic movement issue.

I've got the ship accelerating and turning. On a right-arrow button press, I'm using 'Transform the Sprite' to rotate it by a set amount, then 'Set the speed and direction of motion' to direction: image_angle and speed: obj_PlayerShip.speed Kaleida health email.

This works great moving forwards - but when the ship is in 'reverse' and it turns, its speed reverses direction and it's suddenly moving forward. I've tried a few strategies - 'If' checks to see if ship's speed is positive, checks to see if the direction of motion is the same as the angle of the sprite..no luck.

Is the speed of an object relative to its angle? I would expect the ship moving backwards to have a negative speed value - but it seems like this is not the case.

Any help is much appreciated.

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