<![CDATA[Students need practice evaluating the sources of historical information, but map-based digital history media rarely display source information and the limits of certainty alongside their narratives. This design and technical testing study produced a digital narrative map of the spread of news regarding the 1945 Proclamation for 11th-grade high school history classes. The ADDIE model guided document-based analysis, design, prototype development, and developer testing; expert validation and classroom implementation were not conducted. Four cards cover Jakarta, Bandung, Yogyakarta, and Surabaya, drawn from secondary and retrospective sources, including source origins, event types, and chronological uncertainties. Schematic maps, chronological lists, and six source-investigation tasks run locally without external mapping services. Eleven automated functional checks passed on Chromium without an interface. The contribution lies in a card structure that keeps source origins and uncertainties visible alongside the narrative. These results demonstrate limited technical functionality; they do not yet prove historical validity, ease of use for students, or learning effectiveness; expanding the corpus with contemporary sources, expert reviews, and student testing following ethical procedures remains necessary.]]>
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