How do i mark a spot on the Lowrance hook2 4x GPS?

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: every time i turn on my lowrance 520c it says gps module not resp

I had the same problem. Sent my entire unit back to Lowrance, but they said it was fine. One year later, I find out that I did not receive or have the correct parts to hook up the GPS unit. I needed the NMEA 2000 T connector and terminator plugs. Look at your manual and hook it up the way the manual says. It will require a NMEA 2000 T and at least one 60 ohm terminator plug. Seems the GPS module sends back some kind of signal that if not absorbed by this thing will mess up your unit. Mine works since I got it hooked up correctly. HD

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.

Phil Walker

• 610 Answers
• Posted on Jun 11, 2012

SOURCE: My Lowrance unit gives me a message of

Hi check the receiver has 12 volts at the blue plug, if so the mushroom is most likely fried, regards Phil.