The most elegant way to geo tag images would be to buy at least a Nikon D5000, better a D90. Those two cameras can use the really cool Nikon GP-1
http://www.nikonusa.com/Find-Your-Nikon/Product/GPS/25396/GP-1-GPS-Unit.html
Now to connecting your fine Garmin GPS to your D60.
Here is a link that will get you going the right direction.
http://www.carto.net/projects/photoTools/gpsPhoto/
At present I have no clients that require GPS tagging. If they do, I have the cameras that can use the GP-1.