Had assumed that features of KAP140 would operate independently of route manager, with KNS80 in default mode. HDG seems to work correctly when selected by bug, but having problem getting system to intercept and track radial, using NAV. Have radial degrees set with bug as well as in radio menu. With NAV selected aircraft wants to maintain selected heading, not intercept.
Aah, intercepted ok in Cessna 172, so problem seems to have been installation in Navion.
Kind Regards