About 1 1/2yrs. The I phone maps always seem to be more up to date. It's a tool we use often, however you don't want it to be the deciding factor on size of the property. It does no show dips and hill and ditches very well. We've been burnt once or twice because we looked at the map but not close at the property. Costly mistake that won't happen again! Now we use it when a customer calls initially then make a site visit.