Every antenna rotator will move at a different speed, dependant on make and condition, and different runs may change in speed as the rotator warms up. The program has facilities to compensate for these differences.
The program takes up to 360 readings per plot. To allow for different rotator speeds the time taken for these readings is variable under user control. Precise synchronisation of the program's beginning and end of plotting with the rotator's time is difficult. To cater for these differences you have the ability to 'trim off' unwanted readings at the start and end of the plot.
You can also optionally have the program automatically start plotting when a carrier is detected and stop plotting when carrier is dropped. This mode of operation is particularly useful when plotting the transmitting station's antenna because you do not know when the station operator starts and stops his rotator.