Plaisted and Ritchie (1772) 

A chart of the northern part of the Bay of Bengal: between Point Palmiras and the Aracan shore

A link to image files of this map can be found here: Princeton University Library, digital maps and geospatial data

See also Mapping Bengal  by Ehteshamul Huque (Atlanta, USA)

A Google Earth Engine split screen application to show  the Plaisted and Ritchie map in comparision with modern data sets (GEBCO bathymetry data).

Move and zoom one of the maps to see the other map showing the same region.

A chart of the northern part of the Bay of Bengal: between Point Palmiras and the Aracan shore