Pace mode: enter your goal finish time and get the required pace. Time mode: enter a pace and get the predicted finish time. Progress mode: enter how far you have run and how long it took to project your finish.
Even split: identical pace from gun to tape. Negative split: first half is 1.5% slower, second half 1.5% faster - the strategy used by most marathon world records. Positive split: go out 1.5% faster then hold on.