DME quality

[AWieder]

This isn't a rehash of Certified IFR navigation with Skyview, but I have a question about "GPS in lieu of DME". (originally approved 1998)

Since the new GPS2020 is documented to meet the position accuracy (0.05nm) and integrity needed for ADS-B, it seems better than the accuracy specified for DME or the original enroute IFR GPSs (TSO-129). And if the monthly fix database comes from the FAA...

Any chance the Skyview virtual DME using GPS-2020 could become approved for use specifically for "GPS in lieu of DME" supplemental info??

 

[Raymo]

I did some interweb searching...

Here is a link to an old article on the topic. I doubt much has changed since 1998. As with other IFR regulations, it is as much or more about the database than the equipment.

https://www.aopa.org/advocacy/advocacy-briefs/air-traffic-services-brief-use-of-gps-in-lieu-of-dme-adf

Another newer article...
http://simfliteminnesota.blogspot.com/2007/10/substituting-gps-for-dme-and-adf.html?_sm_au_=icHDSMTrH6nv7MQV

 

[AWieder]

Thanks. I'd seen the AOPA article and couldn't find anything else from them since.

The AC and TSO-129 have been replaced in the last 20 years while GPS equipment and software definitely gotten better.

With an SL-30, no DME and not enough $ for a GNS, I'm looking for possibilities to enable us to fly some VOR/DME approaches such as at S21 with equipment already installed. AC20-138 vs TSO-145?

 

[mr.sun]

I have been thinking about operating with the same assumption. After all, I can legally use VOR and ILS direction information displayed on Skyview when sourced from my SL-30, so it makes sense to file /A when using Skyview to supply distance information sent from the approved position source, GPS 2020.