I HAVE A LOWRANCE HDS7. WHEN I TURN IT ON THE LOWRANCE

Make sure you have the settings correct.. sometimes mine decides I live 250 miles away..in another state.. I reset it and its fine..?????

Hey Justin you must find out why you are blowing fuses FIRST!!
Then you can trouble shoot effectively.. http://www.lowrance.com/Root/Lowrance-Documents/US/ELITE-5-7_HDI_OM_EN_988-10647-001_w.pdf

Yes, all Lowrance products will use and display Navionics map data.
Compatibility Guide America
Here is a link to the navionics compatability page so you can see which map cards will work in your unit.

No biggie here.
Here's the link to your manual!

http://www.lowrance.com/Root/Lowrance-Documents/CA/HDS-5-7-5M-7M_OM_EN_988-10041-001_w.pdf

Hope this helps.

go on line to lowrance get your wiring diagram off line

Try a hard reset:

1. Turn the LMS-330 off
2. Press and hold the ZIN, ZOUT, and PWR buttons
3. Release the three buttons once you see the "warning, do not rely..." message appear

If you get that far, the problem is solved. If you get boot failed again, try installing the latest update which can be downloaded from http://www.lowrance.com/en/Downloads/Product-Software-Updates/

If you still get boot failed, you will need to get the LMS-330 repaired/replaced. You can contact Lowrance support at 800-324-1356 or email them by going to http://www.lowrance.com/en/Support/Product-Support/Contact/