This is Part 1 of 2 Lightning Mapping Array training modules. This module introduces the user to total lightning and the source density product provided by NASA SPoRT. While the North Alabama Array is the focus of this module, the concepts can be applied to any total lightning network. Users will learn the difference between total lightning and National Lightning Detection Network (NLDN) data. Also, the concept of a lightning jump will be introduced, which has great use in enhancing the warning decision making process. This module is 16 minutes long and requires the flash plug-in.