If you select the air field AFSml-1 from the group you will get a error message.
Missing Shape Hangerv
To correct this just open the AFSml-1.obg file using note pad and delete the first line
F03VOD0, HANGERV, 0.000, 0.000, 0.000, 0.0000, 0.0000, 2.5169, 3328, 2, 0, -1.00, -1.0, -1, 0, 0, 0
save changes.
Also port-1 and port-2 do not have boat entry positions.
Pokie