Many years ago when I was there I had no problem going anywhere with a hand held scanner. From my submission to Rickey Stein's "Monitor the World".All were in GeorgeTown
47.3000 Radio Station Studio Transmitter link
143.825 Telephone patch
154.400 HVAC repair
157.600 Taxi
164.500 ?
172.350 ?
172.500 ?
173.200 Phone company dispatch
173.300 Phone company secondary
173.400 Mobile Telephone
461.725 Snorkeling tours
If there is a radio shack try there. I had good luck at the one in the Barbadoes.