My application is sometimes provided with geocodes that are a little
"rougher" than I would like.  This means that sometimes a location
might be a few hundred yards off due to rounding errors.  When I try
to create driving directions using these geocodes, it sometimes will
return as unresolvable because a location falls into a lake or in the
middle of a field.

Is there a way to instruct the driving directions to use the nearest
drivable location to the geocode I provide?  How can I deal with this
issue given that I don't control the source data?

To illustrate the problem without getting into the api code, I've
created the following link to show the problem:

http://maps.google.com/maps?output=html&f=d&source=s_d&saddr=tampa&daddr=25.7666666,-80.166666&btnG=Get+Directions

If you look at the geocode, you'll see that the destination is in the
water, but pretty close to some roads.

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