Not sure how often Simon checks TT from Scotland.... As he's my brother, I can answer.
The lap timer is an AIM Solo DL. It logs heaps of data from telemetry to gps position and speed etc. You can export this data to .csv via the AIM software. Being a programmer, Simon wrote his own program to convert this info to a green screen overlay video file that he syncs to The GoPro footage.
Very clever!
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