The 530 has 4 graphical fields built in that will graph Speed, Elevation, Heart Rate, and Power. That's nice, but they appear to only display the last 1.5 minutes. I can't find a way to change that to a longer time constant so it shows 5 minutes or more for example. I tried holding the enter/OK button down like one would to get into Zoom mode on the map page but that did not do anything. Anyone know how to change or if we can change the length of time on the screen for these graphical data fields?