Transport Canada has just published an updated Aeronautical Information Manual (TC AIM). You can access it here.
Highlights include (thank you Ian for this summary):
- Further guidance on the micro (i.e. <250g) drone category. For example, any payloads, stickers and prop guards can push the weight above 250g and into the small category.
- Clarification on units of measurement used in aviation (e.g. heights, and imperial measurements), and the need for coordination/standardization when communicating with other airspace users.
- Operations in the vicinity of aerodromes, airports, and heliports. Most notably, where you can not establish contact with an airport/heliport operator, the need to make proper radio calls, and as such, the requirements for an ROC-A.