Systems and methods are provided to guide an emergency dispatcher in responding to emergency calls where the incident location is not known. The systems and methods can include a locator diagnostic tool configured to facilitate thorough and consistent information gathering for calls where the incident location is not known. The locator diagnostic tool may traverse a logical tree configured to gather information that can aid in identifying the incident location and/or provide instructions to the caller that may allow the incident location to be identified. For example, the locator diagnostic tool may aid callers in locating devices designed to transmit their location. The locator diagnostic tool may traverse different logical paths depending on if the caller can speak freely or not, depending on if the caller or a third party is missing, and/or depending on the type of caller location (e.g., inside, outside, or underground).