Got It Covered?

Approaches with both GPS and VHF sources are common, so don’t forget how to use all your navigation functions. Sometimes you need ‘em all, and at the same time.

Elaine Kauh

Saturday, November 18, 2023 at 07:46 PM ET

Verified

Key Takeaways:

Modern IFR GPS units are often "two-in-one" navigators, integrating VOR/Localizer receivers, but pilots frequently underutilize these non-GPS capabilities.
Thorough review of approach charts, particularly the "Notes Box," is crucial as procedures often incorporate RNAV elements or require specific equipment like ADF, DME, or radar, for which GPS can sometimes substitute.
While certified IFR GPS can replace ADF, DME, and VOR for many navigation tasks and fix identifications, it typically cannot substitute for raw lateral guidance on the final approach segment of ground-based approaches.
Pilots should maintain proficiency with all navigation equipment, including VOR/LOC, and understand their GPS unit's capabilities and limitations to ensure legal compliance and maximize operational flexibility, especially for alternate airport planning.

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Remember that your IFR GPS, now standard equipment for all flavors of light aircraft, is usually a two-in-one navigator. Yep, it has more than the habit-forming GPS receiver displayed on a moving color map. Most units include a VOR/Localizer receiver, a page displaying a CDI (Course Deviation Indicator) needle, and is likely connected to a primary or secondary CDI as well. Maybe you also held onto an existing navcom with a CDI that still works. Even if you’re well versed in these features, they likely go unused. But don’t get rusty on that stuff yet.

Checking Boxes

My EFB has a neat feature that filters approaches at a selected airport by equipment level: “ALL”, “ILS Only”, “GPS Only”, “Six Pack.” Now, flying a basic six-pack C172 upgraded with a like-new, non-WAAS GPS, we can use LNAV mins, VOR, and localizer MDAs. The installation moved the older indicator and navcom to number two.