Her is an extract from
fugawi site looks like they might be
bsb chart. CYC means
Caribbean Yachting Charts
"...."..."...........
2011 Edition Charts Now
Shipping
These nautical charts of the the US
East Coast and
Caribbean are made in the BSB/EAN format from Nautical Publications' (NV.Charts') popular Caribbean Yachting Charts, for use with
Fugawi Marine ENC or other compatible
software.
US
East Coast and Caribbean Yachting Charts are especially produced by Nautical Publications with the requirements of the yachtsman in mind.
Each set includes both the paper printed map and a companion CD with the
electronics BSB version of the charts.
NEW: Raster charts are also available for direct download from Fugawi X-Traverse for use in select
software products.
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If the file extension is .kap they should
work ok with OpenCPN
Regards
Richard