Hi Curt, Thanks. That has nailed it for me. I've gone for a value of 2 secs for now, as it is great with a few aircraft tracks. I'll see how it hangs together when I tap the APRS-IS feed later :) Cheers, Darren, G0HWW On 04/06/12 18:03, Curt, WE7U wrote: > next_redraw = current_time