OK so you have the, by now very old hdr/pcx charts. Late eighties/early nineties Maptech
technology. Your charts must be around 15 years old, or so.
cannot directly display these carts as explained in the OpenCPB Documentation
- https://opencpn.org/wiki/dokuwiki/doku.php?id=opencpnpencpn_user_manual:charts:cha rt_formats
A modern alternative is, as mentioned earlier by Barnakiel, the NV charts. Another alternative is to buy UKHO S63 vector charts through http://o-charts.org/
Looking ahead, maybe a year or so, and you will probably find native OpenCPN vector charts for the Caribbean
, based on UKHO cartography. Keep checking http://o-charts.org/
, for new chart releases.