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gps sometimes off

I have noticed that sometimes my 245, maybe 1 in every 20 runs the GPS goes a little odd.  For example tonight it was fine for the first mile then all of a sudden it shot me about 15 metres on the other side of the road.  Then for the next 5 miles it tracked my movements but always that 15 metres out.

As a result of this the distacne was correct tut the map looked off as i was paralell 15 metres out.

Anyone else noticed this?