Description: This layer represents a 8,000 by 5,000 meter United States National Grid (USNG) for those portions of Florida falling within the NAD83 UTM 17 N zone. The USNG is an alpha-numeric reference system based on the UTM coordinate system and is similar to the Military Grid Reference System. Use of the USNG ensures a uniform grid mapping and positional reporting system for search and rescue, emergency planning, response, and recovery.This grid is used in creating the Lake County Fire Rescue Mapbook that is used for emergency response.