TSB Canada informed me that the towplane track came from its GPS. The glider PowerFLARM was destroyed, but they were able to retrieve the post release glider track. TSB does not put up public dockets like the NTSB.

I had a tow behind the accident C-182 last year and turned right after release into a hopeful thermal. About 270° through the turn I saw the towplane coming back at the same altitude and promptly steepened my turn.

Heard nothing from my PowerFLARM and did not think to see if the PF display showed the towplane as I was fully occupied staying out of its way. Possibly the towplane PF may have been inop.

On a somewhat disturbing note the presence of a PowerFLARM in a private glider brought to the field has delayed the annual sign-off. It seems the AME (Canadian for A&P) is under scrutiny by Transport Canada for signing off on gliders (and possibly a towplane) with PowerFLARM installed.