Reader Mail

AVmail: March 30, 2015 »

Vern Schulze writes: "I am a single-engine aircraft owner and private pilot that only flies VFR. So the following question is based on my 2,000 hours of flying over the past 33 years. My Grumman Cheetah is equipped with the standard altimeter, and my airplane has a Mode C transponder. I also have three GPS instruments, two portable and one panel-mounted. The panel mount is strictly a VFR unit with no WAAS capability. One of the two portables has a WAAS capability. Over the years, flying at 8,000 to 10,000 feet in Nevada, I have noticed some remarkable variations in the altitude reported by the three GPSs versus the altimeter when corrected for barometric pressure. Since most of my flying is in mountainous terrain, these variations that approach 500 feet make me wonder why we rely on altimeter readings rather than GPS altitudes." Click through to read the full text of this letter and other mail from AVweb readers. More

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