The water content data file is configured as ring memory, and it can hold more than 1,000 values. When the file becomes full, the oldest data are overwritten and storage continues.
The zone data file, in contrast, is configured as fill-and-stop memory. The zone data file holds a list of zones that have been created. A zone is created each time a datum is stored in a new location. Each zone record contains the center position (latitude and longitude), radius in meters, and the zone name. The zone data file can hold more than 100 zones, but when the zone data file is full, the DISK FULL error is displayed, and a new zone cannot be created until an old zone is removed. To remove a zone, follow these steps: