I usually chase on the surface and I only chase if I have a good opportunity.
Like the others have said, listen with the hydrophone and get a rough idea of their course and speed. Once you have that, surface and stay out of visual range, I usually stay out around 12km or so which beyond my own sight so I know they can't see me either. Run about halfway to your intercept and check the hydrophone again, if they're on course surface and run like hell. Once you turn to become perpendicular keep and eye out for their true position, they hydrophone will only get you so close, once you get a visual you can plot the true course and try and position yourself between 700-1000m abeam. That way if they decide to change course again you're close enough to correct and watch them suffer a catastrophic engine room explosion.
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