I have a Garmin Oregon 450t and it is about 300 yards off in its location found ont the map and where it is in reallity.
I have changed the maps and made all the adjustments that have been suggested. I have the US road maps, inland US lakes, east coast Blue water charts, and inhanced mapps of Canada. No matter the scale or definition the unit is still not where it shows on the map. My cell phone is more accurate.
I am going to return the unit to Garmin.
Nat Lambeth