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

Here is Why You Need An Adapter

The outlet and plug type used in Iceland are C and F 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

Iceland

In Iceland, outlets of type C and F are in use.

Type C

Type F