Three questions answered at once, because on a pass there is no time to
go looking for any of them: where the bird is, when the next one comes,
and what to tune. The map draws each satellite's footprint — the honest
answer to "can I hear it", since everything inside the circle has the
satellite above its horizon — and the selected one's path over the
ground. The pass list is every favourite in time order, the one in
progress in green.
The readout shows the corrected frequency large and the nominal one
beneath it. Only one of them, and an operator cannot tell a Doppler
correction from a mistuned transponder.
The map opens on the station rather than the Atlantic, and remembers
where it was left like the others. The panel is mounted only while its
tab is visible: it asks for the tuning once a second, and there is no
reason to compute an orbit nobody is looking at.
rouggy
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