Here, in these maps of Grenada, the Grenadines, and the Caribbean islands, you can see that Grenada is one of the furthest south-east in the Windward Islands. It is further south than St Vincent or Barbados, and also the nearest to the islands of Trinidad and Tobago.
You can also buy a local map of Grenada for touring, when on the island.
Map of Grenada & Grenadines: Ronde Island, Diamond Island, Carriacou, Petite Martinique, Petite St Vincent, Union Island, Mayreau, Palm Island and Tobago Cay