There are at least 3 solutions:
- Row facing forward by pushing on the oars, often standing up. Maine Coast fisherman used to do that at times so they could safely navigate the rocks as they came close to the shore.
- Use the FrontRower(TM) System (http://www.frontrower.com/). Not only do you face forward, but you can use your legs and/or arms to row.
- Use a mirror. I use a Yamaha motorcycle mirror with an 8" stem: (http://www.jpcycles.com/product/7600075)
This is a close-up of the image in the mirror, It's difficult to see in this photo, but you can see about 10 degrees past the center line of the boat... sufficient to keep from running into another boat.
The mirror is bolted to a piece of oak held by a wing nut with lock washer on a stud coming up through the gunnel. Easy to remove... weather proof and effective.
If you haven't already done so, attach a mirror to your oar cruiser. It is definitely worth the effort.
Comment below with how you attached the mirror on your boat.