Reading these numbers
Averages over many shots are trustworthy — unbiased GPS error cancels out.
A single round carries the full per-shot error, so round-to-round
swings of ±15 ft mean little.
The trend line only reports a direction when the slope actually exceeds the
round-to-round scatter; otherwise it says no clear trend rather than
inventing one. A longest-throw record inside the measurement error is marked
within error — it isn't distinguishable from the previous best.
Fairway rate counts only drives where you recorded a result.
Averaging over all drives would treat unlabelled shots as misses.