Need a 2nd nav with GNS 430?

Jose wrote:

3: if you can't update the database (such as you're in the middle of a
trip during the window) you can't do IMC anymore. BTDT - at Sun'n'Fun,
no less.

Chalk another one up for the 480...you can load two cycles up and it
auto switches.

4: you're in some bumpy clouds, reach over to switch off the strobes or
switch on the pitot heat or something, and a bump causes you to hit the
master. Oops - flip it back on. VORs come right back. NAV comes right
back. ADF comes right back. DME comes right back. GPS begins to
acquire satellites, do its self test, and waits for you to push the
lawyer button before continuing. Meanwhile, you're doing 150 knots in
the soup and just got an amended clearance. BTDT

Does not the 430 NAV section come up immeciately?


6: If you have an electrical failure in IMC, you may need to decide
what units to leave on the battery and what units to shut off. I don't
know the 430's current draw; you may be better off with just a single
VOR in some cases (though I wouldn't be surprised if the old VOR
receivers draw more than the new GPSs). BTDT, though without the 430.

Depends on what your other radio is. If it's comething modern like
an SL30, you're probably OK. But I was looking at the current draw
(again for the 480) and it doesn't draw much until you press the PTT
on the comm side.

Does not the 430 NAV section come up immeciately?

Maybe the VOR part does, but the GPS doesn't. And if you've been
navigating by GPS, the VOR might not be set as a backup, but instead be
set for something else.

But it's a good point, and a good reason to have the 430 VOR set to back
up any navigation to/from VORs. Of course, navigating by GPS direct
this may not be that often.

Jose
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