Hearing
Here is how the guidelines are stated with regards to hearing. Please note the bold text at the end of this explanation:
Hearing thresholds are checked at 500 Hertz, 1000 Hz, 2000 Hz and 3000 Hz. The frequency responses for each ear are averaged to give a measure of hearing ability.
ORIGINAL DECK OFFICER LICENSES: An average, unaided hearing threshold of 70 db or less for each ear and functional speech discrimination of at least 90% is acceptable.
RENEWAL OR RAISE OF GRADE: An average unaided hearing threshold of 70 db or less for each ear and/or functional speech discrimination of at least 80% at 55 db for each ear is acceptable.
DECK OFFICER: Hearing aids may be used by applicants to meet the auditory requirements for all renewal or raise of grade transactions. The aided threshold should be 40 db or less in each ear and functional speech
discrimination should be at least 90% at 55 db in both ears. The unaided threshold should be 70 db or less in each ear and functional speech discrimination of at least80% at 55 db, binaural.
Other conditions outside of the ones discussed may be considered for a waiver when recommended by the Officer in Charge Marine Inspection.
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