avocado> db.complex.drop()
true

avocado> for (i = -90;  i <= 90;  i += 10)
.......>   for (j = -180;  j <= 180;  j += 10) 
.......>     db.complex.save({ name : "Name_" + i + "_" + j, 
.......>                       home : [ i, j ], 
.......>                       work : [ -i, -j ] });

avocado> db.complex.near(0, 170).limit(5);
encountered error while printing: cannot locate suitable geo index

avocado> db.complex.ensureGeoIndex("position");
avocado> db.complex.near(0, 170).limit(5);
{ "name" : "Name_0_170", "home" : [ 0, 170 ], "work" : [ 0, -170 ], "_id" : "..." }
{ "name" : "Name_0_180", "home" : [ 0, 180 ], "work" : [ 0, -180 ], "_id" : "..." }
{ "name" : "Name_10_170", "home" : [ 10, 170 ], "work" : [ -10, -170 ], "_id" : "..." }
{ "name" : "Name_-10_170", "home" : [ -10, 170 ], "work" : [ 10, -170 ], "_id" : "..." }
{ "name" : "Name_0_-180", "home" : [ 0, -180 ], "work" : [ 0, 180 ], "_id" : "..." }

avocado> db.complex.geo("work").near(0, 170).limit(5);
encountered error while printing: cannot locate suitable geo index

avocado> db.complex.ensureGeoIndex("work");
avocado> db.complex.geo("work").near(0, 170).limit(5);
{ "name" : "Name_0_-170", "home" : [ 0, -170 ], "work" : [ 0, 170 ], "_id" : "..." }
{ "name" : "Name_0_-180", "home" : [ 0, -180 ], "work" : [ 0, 180 ], "_id" : "..." }
{ "name" : "Name_-10_-170", "home" : [ -10, -170 ], "work" : [ 10, 170 ], "_id" : "..." }
{ "name" : "Name_10_-170", "home" : [ 10, -170 ], "work" : [ -10, 170 ], "_id" : "..." }
{ "name" : "Name_0_180", "home" : [ 0, 180 ], "work" : [ 0, -180 ], "_id" : "..." }