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This document describes a simulated (but realistic) passive sonar scenario for benchmarking tracking algorithms based on one-dimensional (1-D) measurement data consisting of either frequency or bearing. The document accompanies the five data set ASCII files mentioned below and provides sufficient detail to generate data matching the data in the files or new data with different scenario parameters for acoustic contacts, ownship (submarine) and/or environment. The data and description presented here are released into the public domain to encourage researchers to use a common data set and share their results. Instructions for citing this data set are provided at the end of the document.