I have a Navionics SD card called a Fish'n Chip. It's basically the same as the regular chips except it's in black and white instead of color. It's for ocean fishing.
If it's what you are looking for I'd let it go for $50.
Send me an email if you want to know more.
Thanks. I will keep it in mind but would prefer to get the standard colour charts. I understand they have less bottom detail which may be a little less cluttered for a small screen back up GPS. The ID code I gave is for the Gold version but the Silver or Platinum versions would also work for me.
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