In the fleet Iain Percy and Andrew Simpson squeezed ahead of Fredrik Loof and Anders Ekstrom down the first run to round second but then dropped to seventh while covering the Swedish boat and with Robert Scheidt and Bruno Prada leading it meant the Gold was with the Brazilian pair.
Round the final mark the Poles lead and Scheidt and Prada had dropped to fifth, meaning that Percy and Simpson were back in Gold if they beat the Swedish boat.
Down the final run they separated and as they came into the line Percy and Simpson crossed fifth in a goup of four boats, with Loof and Ekstrom last ten seconds behind and it was Gold to Britain.
Scheidt and Prada of Brazil took the Silver with Loof and Ekstrom dropping to Bronze, tied on points with the Brazilian pair.
Star - Final positions after the Medal Race
1 GBR Iain Percy, Andrew Simpson 10 58 45 pts
2 BRA Robert Scheidt, Bruno Prada 6 64 53 pts
3 SWE Fredrik Loof, Anders Ekstrom 20 68 53 pts
4 POL Mateusz Kusznierewicz, Dominik Zycki 2 72 59 pts
5 SUI Flavio Marazzi, Enrico De Maria 4 70 59 pts
6 FRA Xavier Rohart, Pascal Rambeau 18 81 69 pts
7 GER Marc Pickel, Ingo Borkowski 8 84 70 pts
8 POR Afonso Domingos, Bernardo Santos 12 89 72 pts
9 NZL Hamish Pepper, Carl Williams 14 93 80 pts
10 ITA Diego Negri, Luigi Viale 16 105 92 pts