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Aluminum will block a GPS signal, but the aluminum needs to be above the antenna and within approximately 12 inches or less.
the other major source of interference is the electromagnetic field of other electronics in close proximity to your GPS antenna. Typically within about 24"-30" or less in distance from the antenna. The internal antenna of the HD 10 is top dead center of the unit.
Turn the "WAAS" off on your unit and see if that improves reception.
Hope this info helps.
Try this link:
http://support.lowrance.com/system/selfservice.controller?CONFIGURATION=1001&PARTITION_ID=1&secureFlag=false&TIMEZONE_OFFSET=&CMD=VIEW_ARTICLE&ARTICLE_ID=2874
My HDS gen 2 touch did this and I decided to open it up since Lowrance wouldn't help (out of warranty 2yr). The ribbon cable from the motherboard to the display came loose. Connected it back up and now I'm in business
Test your Lowrance HDS 7 on different power sources e.g. on another motorboat to find out whether this is the problem of the boat's power supply or the HDS 7 itself - this advice will only help you to determine whether to call the boat-repairman or the lowrance hds 7 seller warranty service.
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