If you’ve recently visited the waterfront in Lower Manhattan, driven along the FDR Drive, or hung out in one of the Brooklyn parks along the East River, you may have seen it: a large, bright floating billboard chugging by in the water.

Attorneys with the city’s Law Department say those waterborne advertisements are not only in poor taste, but are illegal, and are asking a federal judge in Manhattan for an injunction to keep them off the waterways around the city.