What is the purpose of a battery isolator switch, and why is it good practice to use one when leaving a boat unattended for an extended period?

A. Isolator switches exist purely to prevent theft of the battery itself

B. An isolator switch physically disconnects the battery from the boat's electrical circuits — switching it off when leaving the boat unattended prevents small, easily-overlooked parasitic loads (bilge pumps left in "auto," instruments, alarm systems) from silently draining the battery flat over days or weeks, which contributes directly to the sulfation problem covered elsewhere in this section

C. Isolator switches are only fitted to boats with more than one battery bank

D. Using an isolator switch has no relationship to how well a battery holds its charge over time

A. Nothing — a test lift can proceed immediately after repairs

B. Testing should wait until cargo operations begin

C. The area within the grab's swing radius should be cleared of personnel before the lift

D. Only the crane operator needs to be aware the lift is happening

A. Who must remain clear of the exclusion zone while the lift takes place

B. The lunch schedule for the deck team

C. Only the weather forecast for the next watch

D. The cargo manifest for the next port