You can open the map in a lightbox. Just add the parameter lightbox to the mosmap or set it as a general option. You also can set the size of the lightbox with lbxwidth and lbxheight.
A caption is possible with lbxcaption and the zoomlevel can be set different then of the showed map by parameter lbxzoom (version >= 2.11).

{mosmap lightbox='1'|lbxwidth='600px'|lbxheight='600px'|lbxcaption='Map'|lbxzoom='16'}

The map can be invisble in the content and only showed in a lightbox:

{mosmap lightbox='1'|lbxwidth='600px'|lbxheight='600px'|show='0'}