Refer to the General Student Pilot Route Manual ED-4:Flying VFR from PEITING (47°48.0'N, 010°55.5'E) to IMMENSTADT (47°33.5'N, 010°13.0'E).Determine the minimum altitude within a corridor 5 NM left and 5 NM right of the courseline in order to stay 1000' clear of obstacles.