Your bullet states bestinclass internal 5 hz gps internal 5 hz gps updates position and heading 5 times per second to make marking and returning accurately to waypoints easier

I understand this product comes with basic maps and thats all i need but when there is over a 1000 feet deviation on my chart compared to where i actually am there is a large issue especially when the chart shows im on land the entire trip and on the opposite side of the river on land

I have used garmin gps for years