I'm in the process of doing the same thing. I consulted Lowrance and found out a few things. First the LMS 520 will not work with the LGC 2000 GPS receiver that comes with the 332. You have to use the LGC 3000 receiver that comes with the 520 and buy an adapter cable to network the 332 with the new receiver. The adapter costs approx $25. Clear as mud?????
You can order the adapter from LEI extras. Google it to get the number.



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