John, I bought the Raymarine raychart 425 (B&W) last season. I didn't see the need for the extra $$ for color. This unit was under 500 with all the features of the big boys and a 6" screen, but it is smaller body for space challenged craft.
As for zoom, each chip has areas where the scale is different, like in some harbors the zoom is greater and has more detail than open ocean. At max zoom in an area where the chip has the smallest scale, I can zoom down and practically fill the screen with a rockpile that is maybe 10-20 feet across. I love this unit although I have nothing to compare it to. my buddy liked it so much he got the same one this season.
If you have specific questions, let me know and I'll try to answer......
V.
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