Found my problem with the airfield.
If you raise the altitude of the land after you had already placed an airfield then that is what seem to have screwed this up.
Went into the mymapname.oba file and set all the alt settings to the altitude of the base.
F01TWR0, twr1, -200.573, ((((6.000))))), -325.004, 0.0000, 0.0000, 0.0000, 3328, 0, 1, -1.00, -1.0, -1, 0, 0, 0
the 6.000 is the alt of my airfield but it original was 0.000, had to reset at the objects of the base to 6000. I guess I could have deleted airfield and then made another one.
Pokie