You could use Triangulator to do just that:
1. create points from the nodes in the polygons that represent the bodies of
water
2. use Triangulator to create Thiessen polygons around these newly created
nodes/points
3. calculate the distance to the node that is in the same Thiessen
polygon as the point you want to calculate the distance from....
As easy as 1.2.3.... :-)
you can download a free trial version of Triangulator at www.mercatorgeo.nl
Good luck
Roeland
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