Good Thinking, Pam !
I entered "preventative guardsman" in google (work gets boring sometimes !) and found:
http://archiver.rootsweb.com/th/read/Mariners/2002-04/1018651731"... while serving as a Water Preventive Guardsman at St Agnes."
then I found :
http://morrab.tripod.com/known_coastguards.htm"In 1809 the Board of Customs formed the Preventive Water Guard to fight smuggling. This water borne force used small boats to patrol every bay and cove. In 1822 the Water Guard became the Coastguard and were placed under the Treasury and strengthened with 151 stations organised in 31 districts. At each station the chief officer, chief boatman and boatman were experienced naval seamen or fishermen. Supplied with ammunition and stores, they were at sea whenever possible in their four or six oared galley, and in bad weather formed a shore patrol. "
Zeb,
Was that just curiosity, or are you searching for someone ? If the latter, there is also a database of names on the above site ....