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Navionics micro SD for fish finders - $50 (Williamsburg II)
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MSD/HM-W
V01.21
SN000000173888
I loved using this on my previous fish finder.
It showed contours very well
Unfortunately it doesn't do contours on my new Helix 5.
Go figure - Humminbird wanted me to buy their Lakemaster product.
Can't find the original SD card but the adapter should work fine.