[quote=MN3]look at speedpucks, tick tacks and similar
you can't use a ipad/phone - they are not waterproof, the screens are about impossible to see with sunglasses on and you can't use the touchscreen through a dry bag (i mean you can but it will not work well and will slow you WAY down messing with it).
Todd is correct with tell tales (although i would think speed metal would sail faster than 70's disco)
having a big screen gps is great to help you find the fastest line .... or settings but since there are soooooo many variables (wind, waves, direction, weight, other boats, etc)
who cares what your actual speed is - you relative speed to other sailors is what really counts[/quote]
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