Approach/Departure Path: An area consisting of a quadrilateral area on the surface of the earth lying directly below the approach/take-off surface.
Elevated/Rooftop Heliport: A heliport elevated more than 75cm above the normal elevation of the ground.
Emergency Landing Area: An area where an unavoidable landing or ditching may take place with a reasonable expectancy of no injuries to persons or damage to property on the surface.
Final Approach and Take-Off Area (FATO): A defined area over which the final phase of the approach manoeuvre to hover or landing is completed and from which the take-off manoeuvre is commenced.
Obstacle: An object that could have an adverse effect on the safe operation of aircraft in flight or on the ground.
Safety Area: A defined area surrounding the FATO which is kept free of obstacles other than objects required for navigation purposes.
Surface Level Heliport: A heliport located on the ground or a floating heliport located on the water.
Touch Down and Lift-Off Area (TLOF): A load-bearing area on which a helicopter may touch down or lift off.
Transitional Surfaces: A complex surface along the side of the safety area and part of the side of the approach/take-off surface that slopes upwards and outwards at a 1:2 slope to a height of 45m.
Flight Path Divergence: The outer edge of the flight path beginning at the outside edge of the safety area and diverging at a uniform rate (10% day use, 15% night use) from a line parallel to the center line of the flight path.
Obstacle Limitation Surfaces (OLS): Consists of a plane in space defining the approach surface, take off surface, and transitional surface.
NVG: Night Vision Goggles
Heliport: An aerodrome used or intended to be used for the arrival, landing, takeoff or departure of vertical takeoff and landing aircraft (VTOL); Typically used in reference to a certified “Heliport” under the Transport Canada 305 and 325 regulations and standards.
Helipad: A designated area, usually with a prepared surface, used for the takeoff, landing, or parking of helicopters. Term is often used interchangeably with the more proper term “Heliport” Typically used to define a less formally developed landing area than a “Heliport” | 
