You Do Need power plug adapter while traveling from Martinique to British Virgin Islands.

Here is Why You Need An Adapter

The outlet and plug type used in British Virgin Islands are A and B and in Martinique are C, D and E. This is how they look like.

Martinique

In Martinique, outlets of type C, D and E are in use.

Type C

Type D

Type E

British Virgin Islands

In British Virgin Islands, outlets of type A and B are in use.

Type A

Type B