# How easy it is to re-project Spotfire maps into other projections, namely polar ones.
I found this explanation in the manual “If you want to use Map Layers in your map chart, the Coordinate Reference System on the Appearance page must be set to EPSG:3857-WGS 84 / Pseudo-Mercator”.
What happens in case you have map layers in Polar projections? Do you have to set a certain coordinate reference system for the Map appearance and a different one for the data layer?
# Is it possible to have the option to enable an end user to change the projection? For example to switch from an European projection to a polar Projection (Web Player end user).