As I've previously written, AHI produced a lot of Batman items, and one item they did a lot of variations of is the Batboat, although most (if not all) of them only vaguely resembled the famous Batboat on the 1966 Batman TV series.
This Batboat had a motor that would propel it along, although you had no control over it!
This model was similar, although perhaps a bit larger and boxed.
Here's a radio-controlled version, probably more popular with the kids!
This last Batboat looks much more like the TV Batboat, and that's because it was a cheaper all-plastic version that they sold as a two-pack with their smaller Batmobile!
You can see one version of AHI's Batboat on this page at Plaid Stallions, along with some of their other licensed character boats!
You should be able to find some of these on eBay with this link!