Stabilize Motion on a panning shot?

Hi Everyone,
Having followed a few tutorials I understand and can track things in After Effects and can stabilize the motion of a video.
Great.
But now I need to stabilize the motion of some video that isn't tracking anything, its a set of panning shots.
There is never a single point that remains a constant through the shots as its a series of close ups of a boat...
So, obviously I can track a single point until it disappears out of the frame, but then I need to swap the reference point to a new point.
How do I do this?
Cheers in advance.
- Rumple

I know this is an old thread but
for any one experiencing the same problem of needing to stabilize a long panning shot then here's the link to a tutorial that explains all without the need for scripts and such.
http://aftereffectstutorials.blog.com/2011/06/19/stabilize_a_long_pan_in_ae/

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