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Rasbats · Dec 7, 2017 · 8383af5 · 8383af5
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 # photolayer_pi
-Plugin for OpenCPN to use SPH satellite photo overlay files.
+Plugin for OpenCPN using GeoTiff satellite photo overlay files.
+
+The transparency can be adjusted, allowing easy comparison of features. OpenGL gives the best results.
+
+GeoTiff files can be downloaded from 'VentureFarther.com' or converted from kaps using the MAP2CMAPCNET program from John Thorn (Mercator lat/lon).