Comparison of coordinate systems can be difficult since often there is no canonical definition. Therefore for practical purposes I would recommend GeoProjection.get_IsSameExt:
Sergei
private bool IsWgs84(AxMap map)
{
var gp = new GeoProjection();
gp.SetWgs84();
return map.GeoProjection.get_IsSameExt(gp, axMap1.Extents);
}Sergei
