Vancouver residents have called them an eyesore and visual pollution.
In response, the city will hold a public hearing today over floating billboards in prominent waterways like English Bay and False Creek.
Council will hear from people who oppose and support the advertisements, such as a 12-metre wide illuminated billboard stationed on a vessel in March.
Patsy McMillan, chair of the False Creek Residents Association, says only people who stand to profit from the ads are expected to speak in favour.