You Do Need power plug adapter while traveling from Saint Vincent and the Grenadines to Jamaica.

Here is Why You Need An Adapter

The outlet and plug type used in Jamaica are A and B and in Saint Vincent and the Grenadines are A, B and G. This is how they look like.

Saint Vincent and the Grenadines

In Saint Vincent and the Grenadines, outlets of type A, B and G are in use.

Type A

Type B

Type G

Jamaica

In Jamaica, outlets of type A and B are in use.

Type A

Type B