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CommercialGP1670F and GP1870F zoom.
Question
How do you get the GP1670-1870 to zoom in tight? I can't get it to zoom tight using the roto key.
Solution
You should have an area C-map 4D chart card inserted into the machine. If the lowest chart level is not low enough for you; you will need to change your unit settings. Please change CHART LOCK to Off under MENU - MAP - MAP CONFIGURATION.