The main difference—as far as scaling goes—is between ENC (vector) and RNC (raster) charts. Not all RNC's support switching to different scales.
NOAA produces ENC (vector) charts and has discontinued RNC (raster) paper charts. CHS makes mainly RNC (raster) charts and ENC (vector) charts for commercial use. I don't know about Explorer charts.
ENC vs. RNC
NOAA produces ENC (vector) charts and has discontinued RNC (raster) paper charts. CHS makes mainly RNC (raster) charts and ENC (vector) charts for commercial use. I don't know about Explorer charts.
ENC vs. RNC
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Jon Longworth
Jon Longworth