I'd always taken GE coordinates to be the same as those I'd get from my GPS's but never checked it before so after reading your post I went and did just that.
The two readings were not the same but were were only 1/10 second different - about 3 metres. I got the same level of error with my second gps so I'd guess that the problem lies somewhere in the way your gps is set up.
Do you have it set to the WGS84 datum? I've had problems in the past with this trying to take readings from UK ordnance survey maps which use a different datum and finding the gps is giving a position about 500m out on the map. I'm not sure what datum GE uses but both my gps's are set to WGS84 and give the above errors
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