The 'A' attribute does not cause a point to appear in the
list of landable fields on the alternates page! Only points marked
with an 'L' for landable will be shown.
If true that seems like an really bad design. When you are low you
need a friendly gps with answers, not a bunch of constraints. It
sounds like the SN-10 is not very useful without also having PDA and
moving map.
Chris