REFLECTOR: EFIS/WAAS GPS

Lawrence Epstein ljepstein at hotmail.com
Tue Mar 27 13:56:33 CDT 2012


GNS48o/CNX80 is also Nav/COM so you have full VOR/Glideslope and if you use
an Sl30 as your 2nd com, you have a second Nav and DME.

On Tue, Mar 27, 2012 at 2:01 PM, Brett Ferrell <reflector at velocityxl.com>wrote:

> Mark,
>
> Most EFIS don't depend exclusively on the GPS signal.  For intance, I know
> that the GRT drops into "dead reckoning" mode when the GPS signal is lost,
> using airspeed, static pressure, accelerometers, and magnetometer to
> generate the display.  It can also display a localizer and glideslope from
> the radio.  I do have backup steam gauges for airspeed, altitude, and an
> electric ADI (and slip/skid in my autopilot), and I'm not instrument rated,
> but when GPS is up and working I plan to use the heck out of it.
>
> Brett
>
>
> -------Original Message-------
> From: Mark Magee **
> To: Velocity Aircraft Owners and Builders list **
> Subject: Re: REFLECTOR: EFIS/WAAS GPS
> Sent: 27 Mar '12 12:37
>
> Hi Kevin,
> Earlier I posted my concerns about GPS as the sole heart lungs and brain
> of an EFIS package. Nobody added to my posts so I don't know what that
> meant entirely, yet you might look them up in the archives. GPS jamming is
> a known problem and growing. There is a real chance your approach into (for
> instance) Branson MO at night in IMC that a pharmaceutical salesman in a
> company car will have deployed his EBay bought GPS jammer that will keep
> his company from knowing where he/she was in the company vehicle will drive
> on a county road intersecting your glide path to the numbers. If your
> reliant on GPS only to get to the runway, you could be in serious trouble.
> If you don't have Electronic INAV or steam gauge back up, not good.
> A more probable scenario is that the female Pharma salesperson parked her
> company car in the Branson Airport parking lot, left the GPS Jammer on
> (plugs into the cig adapter) and her pilot boyfriend picks her up for a
> weekend in Vail. She leaves her GPS jammer on all weekend long and you lose
> your NAV (EFIS) before you descend below the soup.
> I personally won't let GPS alone run an instrument approach because of
> this issue. Apparently it is easily jammed
>
> Mark B. Magee
> Sent from IPhone 4
>
> On Mar 27, 2012, at 7:48 AM, Kevin Baker <flykb at verizon.net<http://compose.php?to=flykb@verizon.net>>
> wrote:
>
> > Hi All,
> > I was thinking about the glass panels and was wondering what others
> experience was with these systems.
> > I'm also interested in EFIS/GPS WAAS precision approaches and folks that
> can speak to that equipment.
> >
> > Thanks
> > Kevin Baker
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