To solve, add four or five words to the message until all is revealed.

I am clearly missing something direction wise
Can I confirm how the 90 degrees clockwise turn works? I had assumed it is relevant to the direction I am travelling so eg if I travelled South from the Z in the top row and got all the way to V in the bottom row, without being able to execute an instruction, my clockwise turn would effectively head me West towards the O in the bottom corner. But perhaps thats the wrong way??
And where do I go next if I have travelled SE from that same Z and gotten to the S in the bottom row? A clockwise turn would seem to send me outside the border
Or am I overthinking it and I should just ricochet like Pong

Your thinking is good, flotsam. If you were to go south to the border, your clockwise 90 degree turn would send you to the left, as you said. If you were to go SE from the Z in the top row, looks like you'd land up in outer space and eventually run out of oxygen - distressed not by your impending death but by the fact that you'll die without knowing the answer.

I want to play more with this one, myself. I'll let you know.

Thanks Pandora