Help With Garmin 70dv plotter/sounder brand new and cant get accurate GPS coordinates

Reel Gator 2Reel Gator 2 Posts: 139 Deckhand
I like the Garmin 70dv and bought one after using it in simulater mode at store...JUST had it installed yesterday and took my handheld with numbers to start inputing. Lo and behold the Garmin is WAY off by 20 miles or more on some of these spots.
Before any of you start talking about the GPS being locked on....it does show correct coordinates of my boat in the driveway and signal strength appears good. What am I missing? I can call Garmin tomorrow (Monday) but wanted to start putting a large number of spots in the unit....so I figured somebody out there knows the answer and it does come preloaded with Bluechart g2. Help?

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