AIRSPACE INFORMATION (Continued) Military Training Routes (MTR) Police Zones Helicopter Routes Primary Route with Route  Name and Tower Frequency Secondary Route Transition Symbol Reporting Points Non-compulsory Compulsory Reporting Point Name  Canadian Airspace  Class B, C or D TCA Airspace Ceiling and Floor Class E Control Zone Special Conservation Areas National Park, Wildlife Refuge, Primitive and Wilderness Areas, etc. Special Use Airspace Only the airspace effective  below 18,000 feet MSL is  shown. The type of area shall be  spelled out in large areas if  space permits. One-way Route  Altitude Changeover Point Recommended Altitudes Maximum Altitude Minimum Altitude Recommended Altitude Class B, C or D Control Zone NOAA Regulated National Marine Sanctuary Designated Areas FAA Chart Users’ Guide - VFR Chart Symbology - Helicopter Charts 53