According to technical archives like the TU Darmstadt OpenStreetMap Mirror , this specific file contains:
Did you find this file in a context? (e.g., a specific gaming or security forum) 0837.7z
It is part of a historical archive of chart data used by mariners and navigation software. Primary Content: Nautical Charts According to technical archives like the TU Darmstadt
: The "0837" timestamp version specifically covers the South China Sea . 0837.7z
: Raster navigation charts used in marine GPS applications.