Create a base map overlay with different layer options:
Base layers (select or one or more)
OSM
UTM Y733 series grid 1:50,000 (to be provided)
UTM XXX series grid 1:10,000 (to be provided)
Display geo-referenced map image on top of base map with ability to adjust the transparency of the image (to enable cross-referencing with base layer detail).
Create a base map overlay with different layer options: