Just be sure we are talking Air Taxi and not Aerial Work....google is your friend.
Canadian Aviation Regulations (SOR/96-433) - Transport Canada
The regulation is in 703.23
703.23 No air operator shall, except when conducting a take-off or landing, operate a land aircraft over water, beyond a point where the land aircraft could reach shore in the event of an engine failure, unless the air operator
- (a) is authorized to do so in its air operator certificate; and
- (b) complies with the Commercial Air Service Standards.
The corresponding Standard is in
CARs 723.23 (a).
- (a) the helicopter shall be equipped with an approved emergency flotation kit and operated in accordance with the Emergency Flotation Kit Flight Manual Supplement;