The first Garmin Intermediate marathon session was a good start to the block: 7.4 km in about 50 minutes, steady effort, and comfortable sensations despite tired sleep.
The best signal was that the run was guided more by feel than by the watch. That is exactly the right approach for easy days, especially when GPS is noisy.
The only small carry-forward is to keep the first kilometers slightly calmer on easy runs. A few quicker splits are fine, but the marathon block will work best if easy days stay clearly easy.
Takeaway. Use Garmin as the structure and pace-based execution as the filter. Easy runs should stay relaxed, while workout days should be controlled rather than forced.
Next step. W01D3 Intervals. First controlled threshold session of the marathon block. Run the 4-minute reps strong but smooth.