[runway.x]     ******make this the next number after your last runway in your file***
id=xxxx         ******make sure this is a unique number in your airbase.dat file***
name=Le Havre Seaplane Base
heading=266
units_across=2
base_lat=N49* 29.41'
base_lon=E0* 5.32'
base_alt=+0
takeoff_start_pos=-600,0
takeoff_stop_pos=1600,200
landing_start_pos=5000,350
landing_touchdown_pos=600,0
landing_stop_pos=-250,0