SOURCE: lowrance 330c gps unit
A "soft reset" can be accomplished by pressing and hold "Pages" key and press and hold "PWR" key till USA map comes on , then release both. A "hard reset" requires press and hold both "Z in" and "Z out" buttons and press and hold "PWR" button releasing all three when USA map appears.
SOURCE: Need a fully working Lowrance 250C GPS Sd card
I have had a similar problem and founf this site where you can get a new card that will work for your GPS. Info, pasted below:
The Nextar GPS-MAP09SDC SD card with updated navigational maps and information has a MSRP of $69.99. Please visitwww.nextar.com to purchase the map upgrades and for more information on upgrading your maps.
I have the same problem on my 520C.
I have no solution but I hope you have find some?
Best regards
Dan
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