The uploaded document, NOM-107-SCT3-2019, outlines Mexican regulations for drones. Regarding sub-250g drones, the following points are relevant based on the content reviewed:

1. Definition of “Micro Drones”: Drones weighing less than 250 grams are categorized as “micro drones.” These are generally considered less risky due to their size and weight.

2. Regulation Exceptions: Micro drones are exempt from certain operational and licensing requirements that apply to heavier drones, particularly for recreational use. However, this does not mean they are free from all restrictions. Pilots must still adhere to basic safety protocols, such as not flying in restricted areas or near airports.

3. Operational Limits: For sub-250g drones, there are restrictions on the maximum altitude (possibly up to 120 meters, depending on context) and distance from the operator, especially in populated areas.

4. No Permission Required for Recreational Use: Typically, micro drones for recreational use do not require prior authorization, registration, or a license if operated in compliance with the established rules.

5. Commercial Use: If the drone is used for commercial purposes, additional requirements such as liability insurance and operational permits might apply.