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Garmin GNS530W software update

laytonl

By laytonl
in Avionics/Panel Discussion

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yvesg Mentor

yvesg

Posted
Posted

Went through this article and still don't get it sorry... try again Jerry.

They don't mention LP+V, only LPV...

Yves

kortopates Grand Master

kortopates

Posted
Posted

I'll offer an explanation that may help what this s/w update really fixes:

Recall with WASS GNS boxes such as the GNS430W and GNS530W, we have LNAV approaches where our Garmin boxes also added ADVISORY vertical guidance.

These LNAV with advisory vertical guidance are LNAV +V and not to be confused with LNAV/VNAV or LPV. 

 

More recently, when Garmin added LP approaches, which are localizer precision approaches like LPV, but with out any real vertical guidance they decided to remove the Advisory vertical guidance for approaches that included the new LP minimums. They got a lot of hate mail from users, because the majority of LP approaches added where added as additional minimums to already existing LNAV approaches that our WASS Garmin box had been previously adding advisory vertical guidance to as LNAV+V. In order to turn off vertical advisory guidance on the LP, they also had to remove it from the original LNAV approach since your box has no way of telling which minimums you are flying to, just the approach. (Instead, the box tells you the most precise approach type it will support based on computed positional error as you approach the FAF and annunciates it in the lower left corner (e.g. (LNAV, LPV etc.)

 

So what this fix does is bring back advisory vertical guidance to the LNAV approaches, as LNAV+V, (that lost it because they also had LP minimums) and added it to LP approaches as LP+V.

 

This was and still is a nice feature since it provides a calculated glide slope that doesn't drop below any step down fixes but advisory only since the glide slope may interfere with obstacles below the MDA to the threshold. For example, often these approaches will have a vertical GS that is NOT coincident with the visual glide slope because of obstacles near the runway environment requiring you to transition to a PAPI GS from the MDA down.

 

Lastly, LNAV+V advisory GS should not be confused with LNAV/VNAV approaches which do give you a true glide slope like LPV but also without the localizer type precision.

yvesg Mentor

yvesg

Posted
Posted

Paul, thanks a lot for the explanation, things are much clearer...

Now, the $500 question to all, how to get this firmware update without having to pay an arm and a leg? My unit just came back from Garmin in November.

Yves

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