Google maps query not working

I've tried everything to get the google maps app to work, but I always get the message "No geo information found in results"

I have tried the following:

sourcetype="dbmon:kv" | eval _geo=tostring(round(Latitude,3))+","+tostring(round(Longitude,3))

I have verified that the eval expression outputs the lat,long in the correct fromat e.g. "36.732,-76.353".

I have also tried hard coding the _geo field:

sourcetype="dbmon:kv" | eval _geo="47.11,0.815"

(value coped straight from the documentation). Yet still I get the same error.

Please can someone help. I'm pulling my hair out over this one!

Thanks in advance

TAO