gboolean (*coord_to_mapcoord) ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
void (*mapcoord_to_center_coord) ( MapCoord *src, VikCoord *dest );
int (*download) ( MapCoord *src, const gchar *dest_fn );
gboolean (*coord_to_mapcoord) ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
void (*mapcoord_to_center_coord) ( MapCoord *src, VikCoord *dest );
int (*download) ( MapCoord *src, const gchar *dest_fn );