Comparison of WorldMap and BlueChart Map Accuracy in Baja Mexico
Tracks and waypoints were made on a Cruise West cruise in the Gulf of Calafornia


"Recorded Anchor" is correct for anchor near Mulege beach with WorldMap map


BlueChart "Recorded Anchor" was actually in the half-moon bay -not the main gulf
And the ship actually went SOUTH of Isla Pitahaya


"Recorded Anchor" in correct position near kidney-shaped island with WorldMap map


"Apparent Error" is the true location of "Recorded Anchor" with BlueChart


"Recorded Anchor" at Puerto Escondido appears correct with WorldMap


"Recorded Anchor" is on penusula instead of mainland shore with BlueChart

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"Recorded Anchor" is in the correct location in bay of Ilsa Del Espiritu Santo with WorldMap map


"Recorded Anchor" is on dry land with BlueChart


"Recorded Anchor" at  Ilsa Del Espritu beach appears correct with WorldMap


"Recorded Anchor" is on dry land with BlueChart

I was surprised that the WorldMap in Baja California appeared to have more accurate coastline information than the BlueCharts of the same areas.  These screen captures are arranged in a north to south order.  By comparing the remembered ship anchor loaction with both programs, it appears that there was a gradual shift in the errors from southwestward to southeastward of from 1/2 mile to two miles.

The captain of the ship commented that the charts he had of Baja were fairly "miserable".  Maybe he should have invested in WorldMap!

Jack Yeazel