747 LNAV/HDG Issues

Howdy: summary is that once I hit “HDG” i can’t turn it off or use LNAV.

If I hit LNAV the heading hold stays on in the PFD. I’ve tried with and without Salty. I’ve tried Legacy and Modern.

Are you referring to heading hold, or clicking the center of the knob for heading select?
Hold locks you on your present heading.
In “hold” you should be able to click the center of the knob to get into “heading select” and rotate it to a new heading.
To get LNav after engaging heading select, you would have to fly an interception course to the flightplan, with LNav selected, and then heading should release when you have successfully intercepted the planned course.

Thank you!!

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