Boat steering
 

I have recently bought a boat and feel I have a steering problem. I have about an inch and a half of play on both sides of the center position. The boat is I/O has a power steering rack and pinion with a single cable to the rack.
It's a problem when moving slowly. I had a mechanic look at it and say it's within range of normal. It's been some time since I have been boating, but I don't remember having that type of play in the steering. Any help would be appreciated.