Daffy one of these days, you'll get the latest firmware for the watch, we put so much effort into.
Segler, Top is the history max for the division you've selected. EG if the left hand pane is 2s, having top in the right hand pane, will be the best 2s since you last zeroed the display. This will be a split screen, funnily enough, the "top" reading will be at the bottom and the last run will be at the top.
So here, I have RSLT 1A/1B set to 2s so the bottom of the split screen will be last run 2s average I had over 10kts, (speed genie set for alphas), and the top of the split will be the best since I last cleared the display.
2A/2B will the same for the 10s average, 3A/3B will be for alphas. 4A/B is turned off.