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      08-04-2012, 10:46 AM   #91
sleepless
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Drives: 11 E90 M3
Join Date: Jan 2008
Location: Redmond, WA

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The 4s has a much improved GPS module so you should not need a better external GPS for your 4S if all you are looking for is lap times. You can also go with a free app likes CMS Lap Timer; it does only lap times; no other bells and whistles.