I will describe how firemen are using GPS to collect hydrant locations and in-the-field data that is then imported into ArcInfo to be processed. It is then fed into the Fire Department's preplan software to help with fire suppression scenarios. The data is also used by Public Works to identify hydrants that may be out of service due to line repairs and relay that information to the dispatchers so that the preplan scenarios can be automatically updated by the Fire Department's software.