Mac users interested in Bsb viewer generally download:
PolarView is a complete user friendly on-board marine navigation system. It is available for OS X, Microsoft Windows, and Linux operating systems. PolarView NS combines free marine chart planning, tides and weather with live GPS navigation and AIS capabilities. It supports ENC charts in S57 format (available from NOAA), raster charts in BSB format, as well as world wide standard S63 vector charts.
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GPSNavX™ Marine Navigation and Weather A very affordable solution for the...
Softcharts and BSB raster charts