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jackc
I was recording on a phone, and you could see that the route it tracked was all over the place. This substantially increased the 'distance' i'd ran, which made my pace much faster. You'll notice runs with a watch have a much smoother line as the GPS signal is more accurate.
I once ran 10k with a friend after I got a watch. She recorded on a phone, which recorded 11.1k. Her 'pace' was about 30 sec/km faster.