I spend 6 months a year on the west coast of Mexico. You know your charts are wrong. Half the time I am sailing on land per the GPS. It is something else when you get to a commercial port and it is right on, But I still sail as if the chart is wrong and watch depth, water color and what other boats are doing. Only use charts as reference material. I guess I am so use to seeing "not to be use for Nav" on all the stuff that I use to get around, that I feel that charts the same. Maybe if I could go faster then 7 Knots I would feel different.