As the seating plan shows the grandstand is made up of 15 different sectors, named A to P (there’s no sector I).
Sector A is the closest to the turn 1 and sector P is the closest to the finish line. The start line is directly in front of sector P and and the podium is just opposite and to the right of P as well.
Each sector has 5 rows of seats. Row 1 is lowest down at the front, row 5 is at the back highest up. But because these Platinum seats are in the highest part of the stand, even the front row is very high up.
Seat numbers start from 1 at the beginning of each section and increase as you go to the right (whilst sat in the stand).