less wind than forcasted (and measured - 30knots before rigging), the 16 (sixteen) shakas gave me the rest.

However, tested my new App GPSLogIt on a Samsung Galaxy S5 against two GT31 units and a SUUNTO Ambit 3:

Max: GPSLogIt: 36.078 GT31a: 36.039+-0.272 GT31b: 36.039+-0.447 SA3: 35.90

best 10s: GPSLogIt: 35.214 GT31a: 35.225+-0.287 GT31b: 35.200+-0.350

5x10s: GPSLogIt: 34.940 GT31a: 34.900 G31b: 34.902 SA3: 35.09