on my initial upgrade, i thought that i could go to the view menu
and just click on Pointing North twice or Travel Direction twice.
neither time did that work. that's when i downgraded back to the
v26_3d_final_cut image. i then burned another v28 image using
the navboot file from my v26_3d_final_cut image. again, i now
have perspective in both modes (pointing north and travel direction),
but i lost Aux Ventilation.

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