Michael Schumacher began his preparations for F1 2010 on Tuesday and the German was seemingly happy following his run in a GP2 Series development car at Jerez in Spain.
The record-breaking multiple F1 world champion is using the test to assess his fitness after neck problems forced him to abandoned his come-back last year when he was initially drafted in by Ferrari to replace the injured Felipe Massa.
Schumacher, who has since inked a deal to team up with Nico Rosberg at Mercedes - former 2009 F1 constructors' champions, Brawn GP - completed 52 laps in total, despite heavy rain and wind.
"The day today was good especially because after a long time I could drive again in a car that came almost close to a current F1," said Schumacher. "Despite the weather not being what we all would have liked all my senses were nevertheless on full alert - this alone was worth it.
"I felt comfortable out on the track from the very beginning, and naturally I'd like to thank our team and the GP2 series very much for the opportunity to drive."
Schumacher, who is testing with Super Nova, will continue running at Jerez on Wednesday and Thursday.
"It is unfortunate that the weather conditions were far from optimal today. Still, Michael could get a good first taste of our car and has already managed to analyse the performance and behaviour of current car," added GP2 Series technical director, Didier Perrin.
"Tomorrow, we hope for better weather and a dryer track which should allow us to move along with our programme and start working together on set up solutions for 2011."