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neoflyer
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Posted: Mon Feb 4th, 2008 03:48 am |
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I just upgraded my Garmin 530 to WAAS. Reading the manual I find user defined VNAV programming can only be done as a rate based function selecting feet per minute as the defined descent criteria. Doesn't seem to be a way to set up vertical guidance based on an angle of descent in degrees.
Is there a way to build angular desents to a user waypoint?
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rkaplan
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Posted: Mon Feb 4th, 2008 04:06 am |
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neoflyer wrote: I just upgraded my Garmin 530 to WAAS. Reading the manual I find user defined VNAV programming can only be done as a rate based function selecting feet per minute as the defined descent criteria. Doesn't seem to be a way to set up vertical guidance based on an angle of descent in degrees.
Is there a way to build angular desents to a user waypoint?
No that is not possible with the 430W/530W. You would need a fairly sophisticated EFIS to do that such as a Chelton system.
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Richard Kaplan, CFII
rkaplan@flyimc.com
http://www.flyimc.com
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neoflyer
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Posted: Mon Feb 4th, 2008 03:49 pm |
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Thanks.
The 496 has the same issue. I wonder why Garmin didn't include this feature? Should be simple programming along the lines of the vertical speed based operation.
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rkaplan
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Posted: Mon Feb 4th, 2008 04:10 pm |
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neoflyer wrote: Thanks.
The 496 has the same issue. I wonder why Garmin didn't include this feature? Should be simple programming along the lines of the vertical speed based operation.
My guess is they would be concerned about pilots using it for homebrew approaches.
____________________
Richard Kaplan, CFII
rkaplan@flyimc.com
http://www.flyimc.com
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neoflyer
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Posted: Tue Feb 5th, 2008 02:59 am |
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Would building a 3 degree glideslope to a runway for situational awareness on night approaches be considered a homebrew approach?
My guess was you are right Garmin doesn't want the responsibility/liability for this but the feature would be so valuable for safe operations that this should outway Garmin's concerns.
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rkaplan
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Posted: Tue Feb 5th, 2008 03:05 am |
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neoflyer wrote: Would building a 3 degree glideslope to a runway for situational awareness on night approaches be considered a homebrew approach?
My guess was you are right Garmin doesn't want the responsibility/liability for this but the feature would be so valuable for safe operations that this should outway Garmin's concerns.
I agree with you but our legal system is not always rational.
This is perhaps also the reason that VNAV shuts off below 500 feet AGL on the Garmin portables.
That said, I remain puzzled that from a legal perspectie Garmin/Jeppesen have been willing to publish LNAV + V approaches. These are WAAs non-precision approaches where the 430W/530W display an "advisory" glideslope. Think about it - an IFR certified GPS is depicting a glideslope on a non-precision approach. Hard to believe there aren't liability implications there.
____________________
Richard Kaplan, CFII
rkaplan@flyimc.com
http://www.flyimc.com
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