Converting rasters

[N R A]

I've successfully used 'r.water.outlet' to create a catchment - how can I 
convert that into a vector boundary ? - is there a r.to.vector cf. the 
v.to.raster command - I can see it in the manual 

Any help would be much appreciated.

Cheers,

Steve Culshaw
NRA North West
e-mail : nra at cix.compulink.co.uk (use this for general usage)
or         sculshaw at cix.compulink.co.uk (Private - only checked at best 
biweekly)