Answer:
Incoming guard walks pool perimeter and scans the entire zone.
Information exchange - special needs swimmers in the water, special classes or programs, any outside user groups present, children who are non-swimmers in the water, and anything else unusual about the pool that day.
Incoming guard scans as outgoing guard steps down.
Out going guard walks pool perimeter and scans entire zone.
Explanation: Lifeguards must regularly get break from active scanning.
difficult to maintain vigilance- hot sun in the summer & humid indoor pools
rotate at least every 30 mins.