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Features July 2019 Issue

Finding Non-Precision

On the GTN, from the main (home) menu, select System, then GPS Status, then SBAS, and turn off the SBAS you’re using. Don’t forget to turn it back on.

Finding Non-Precision

Before GPS, we struggled to find precision approaches to fly for practice and testing. Now, the opposite is true since flying the vertical guidance on GPS approaches is ILS-like.

As we move forward in time with the proliferation of LPV approaches, the phaseout of non-precision approaches using ground-based navaids such as VOR, NDB, and LOC-only will result in fewer and fewer non-precision approaches. Furthermore, some WAAS navigators often provide an advisory glideslope to non-precision RNAV approaches: LNAV+V and LP+V. The “+V” refers to the advisory glideslope. An LP (localizer performance) approach is a non-precision RNAV approach that requires WAAS. Bottom line: there is almost always an electronic glideslope lurking in the shadows.

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