it's me again. I discovered a strange issue with VNAV during climb phase:
Shortly after take off the T/D moves towards
the position of my plane, putting itself ahead of T/C.
This causes VNAV PTH to engage during climb:
This time my route was:
After the T/D had passed me - I had just taken off -
I could reengage VNAV SPD.
It almost seems as if there was an additional false T/D...
Update: It now makes sense to me that VNAV PTH engages due to the ALT constraint
(4000A 7000B). Is it correct though that the T/D moves through me?