The Cargo-Safe transmitters are extremely powerful and will not be attenuated by thin or less dense enclosures ( like a rock-group in a tent ). The sound passes straight through the thin fabric or glass reinforced plastic yacht. What is needed is a much less powerful transmitter like our Cabin-Safe transmitter. This will work with the Cargo-Safe receiver or with the much cheaper Cabin-Safe receiver. The Cabin-Safe system was made for much smaller enclosures.
ABS Classification Society Manufacturing Process Approved
ISO 9001:2008 Certification Number GB13487
IIMS Corporate Membership Number C508
NCAGE Number U0B22
NFPA Membership Number 2800960
FPA Membership Number 27135