I have tried to store a location in my phone contact with many different format of latitude-longitude coordinates, but none of them can be recognized by iGo.
The format I have tried are:
38.897211, -77.039972
N38.897211, W77.039972
38.897211N, 77.039972W
(38.897211, -77.039972)
(N38.897211, W77.039972)
(38.897211N, 77.039972W)

38.897211�, -77.039972�
N38.897211�, W77.039972�
38.897211�N, 77.039972�W
(38.897211�, -77.039972�)
(N38.897211�, W77.039972�)
(38.897211�N, 77.039972�W)