Small Aircraft
Flight Crew Private
Flight Crew Last 90 Days 10; Flight Crew Total 570; Flight Crew Type 130
Situational Awareness; Communication Breakdown
Conflict NMAC; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action
Human Factors
Personal training flight. Weather clear. Wind 05 at 120. Had flown east about 10 miles to the training area East of Morse Lake. I was flying at 2;600 feet. Cleared area. Flew S turns; turns around point; when I saw a plan approach on ADS-B (I was using a Dynon ADS-B receiver and wifi to my cell) Airplane approached close to me from the East. I noticed; since the plane's symbol turned orange - meaning it was 'close' I continued my training. The plane approached closer; and his symbol turned red. I looked to my left where he should have been viewable; but was unable to make contact. I turned away; to the right; and during my turn noticed a Aircraft Y above me; about 300 feet. I ID'd the plane on my ADS-B (Aircraft Y). I immediately pulled power and lowered to 2;100 feet. I turned course to Morse Lake; and the Aircraft Y followed me; above approximately 300 feet. I was able to see it; since my plane has a 'greenhouse' roof; and I was able to simply look up. The ADS-B signal was now one single red dot on my screen. The plane followed me right/left across Morse Lake.... We had NO Prior agreement to fly in formation. I had no way to contact this plane during my flight. The operator of Aircraft Y was obviously following my plane. My opinion; they were playing a weird cat and mouse. This behavior is contrary to proper airmanship. My major concern in writing this report is the fact such an act is now very easy. Any plane equipped with ADS-B can easily follow/shadow another --- and keep the signal on top of another. I have concerns this may be a new way for pilots to play cat and mouse - it is a very dangerous maneuver and against the FAR's separation guide.
GA pilot reported an NMAC near 5I4 non-towered airport and questioned the airmanship of the other aircraft's pilot.