HEMS, public air fields, military air bases or restriction areas or so-called drone zones where drone flights are prohibited.
Around the air fields, air bases and HEMS you find a stronger marked out red colour from the runways or helipads. This stronger marking delineates HEMS with 1 km from the center of the helipad and public air fields and military air bases with 2 km from the center of the runways respectively. Within these areas, flights with drones are prohibited for everyone.
Surrounding the strong red marking, you find a lighter red marking, which delineates the area wherere you can fly maximum 40 metres above the height of the runway or 50 metres above the height of the helipad. However, you must have a drone competence certificate A2 before you can do this.
If the red colour is indicative of a restriction area, there are no lighter markings surrounding the area. That is because flights with drones are generally prohibited (unless the description of the area explicitly states that drone flights are allowed).
Airports, air bases, permanent and temporary restriction areas are mentionen in the order on drones, section 6 (order no. 2253). The restriction areas are based on NOTAMs - Notice To AirMen is A special announcement for manned aviation regarding changes that may effect air traffic.