motomandan will probably get pics before I do but if I get out there today I'll shoot you some. I'm not sure if the 210 will have the same layout.
Long story short: Drilled a hole under the swim deck above the water line, pulled the cable under and around the bucket holder (which you have to remove to gain access to the swim deck underneath), into a pre-drilled access hole into the engine compartment, along the engine compartment above the throttle cable, make a left turn to the cable harness hole, feed through the hole, lift up the access plate over the fuel tanks (under your feet as you stand at the helm), drop under the console where you'll see a small slit that feeds into the changing room, and then up to your chartplotter.
Here's a link to one thread I was looking at when doing the install.
When you attach the cable to the chartplotter, make sure the weight below the connection is being held up by a support of some sort: cable tie, small hook, etc. You don't want that cable constantly tugging on the connection. The boat vibrates underway and when you hit wakes and waves, that cable can slowly deteriorate the connections.