GM1 SECTION I — (b) CONTROL AREAS

GENERAL

(a)When the lower limit of a control area is above 900 m (3 000 ft) mean sea level (MSL), it should coincide with a VFR cruising level as specified in the tables in Appendix 3 to Commission Implementing Regulation (EU) No 923/2012.

(b)In a given control area, the lower limit may be established non-uniformly.

(c)The selected VFR cruising level of the lower limit of a control area should be such that expected local atmospheric pressure variations do not result in a lowering of this limit to a height of less than 200 m (700 ft) above ground or water.

(d)In a control area other than one formed by a system of airways, a system of routes may be established to facilitate the provision of air traffic control.