Controller and pilot reported issues with an unstable approach and the pilot's decision to begin the missed approach procedure before the published missed approach point.
Synopsis
Controller and pilot reported issues with an unstable approach and the pilot's decision to begin the missed approach procedure before the published missed approach point.
Narrative
Aircraft was routine IFR from ZZZ1 and planned to execute RNAVXX from ZZZZZ2 @ ZZZ with a missed approach IFR and then ZZZZZ3 flight plan routing to ZZZ2.Clearance was issued and accepted along with subsequent Published MA (Missed Approach) assignment and an expectation for on course. Aircraft turned randomly west off of the approach well before the MA placing aircraft in unsafe situation five miles before the airport and while on CTAF. LWAS was issued; climb was issued and expedited as well as brasher once aircraft was situated in safe on course routing. The aircraft was 1;000 feet below my turn altitudes. I am familiar with the area and logic would ensure he will not hit anything. WX/NOTAMS were called.Pilot did call in and I spoke with him after the CIC (Controller In Charge). Discussion as to the reasoning for the call in as well as safety and importance of the procedures for the RNAVXX. Pilot stated twice he had to 'bail out' for the unstable approach and he was under the impression that he would go to the MA point. I explained in detail from Controller; CFI;II perspective as to the logic in this error and also recommended to get with a CFII to review how this should work. I have a feeling that there is still confusion after the discussion.
Second reporter narrative
While executing an IFR approach to ZZZ; I descended on course through an overcast layer with tops of 5;000 [ft]. I broke out just past ZZZZZ intersection at 2;700 [ft.] and elected to enter the missed approach instructions...right turn (already well above the 800' required) and climb direct ZZZZZ1 to 4;000 [ft.] and hold. Under 4;000 [ft.] I was off radar. When starting the missed approach before reaching the missed approach point I announced my plans on local Unicom; then switched to assigned ATC frequency and advised them of my actions.The Controller was surprised; and unsettled; asking me to expedite climb to 4;000 [ft]. He later asked me to contact ATC by phone for possible pilot error. He said you should never execute a missed approach until reaching the missed approach point due to possible encounter with terrain.I spent XX years growing up in the ZZZ area; and could see the Name River basin below me & knew there were no obstacles higher than 800 [ft.] within 6 miles; so I felt safe executing the plan; and continuing my IFR flight to ZZZ2.I was trained that while on an approach; should you get off course; immediately execute the published missed; which I felt I was doing.We had a polite conversation and the Controller was concerned with my safety; adamant I could not execute a missed approach before reaching the published missed approach point. I wasn't necessarily in agreement; but accepted his advice gratefully in the name of safety. I'll take his advice and get together with a CFII to sort this out.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.