THE VESSEL DOCTOR METHOD
A useful result begins before the instrument is switched on. We plan around the decision, document the vessel state and preserve the distinction between measured fact, interpretation and authorised acceptance.
Discuss a Survey ↗
FRAME THE QUESTION
Before selecting instruments, define why the survey is needed: statutory evidence, contractual acceptance, baseline condition, complaint investigation, environmental performance or corrective-work verification.
CONTROL THE INPUTS
Coordinate particulars, drawings, previous reports, machinery configurations, speeds and loads, access, permits, safety controls and test responsibilities before attendance.
CAPTURE THE EVIDENCE
Link every dataset to location, time, speed, load, machinery configuration, environmental condition and instrument setup. Document deviations from the plan rather than hiding them.
READ THE SIGNAL
Separate measured facts, comparison with criteria, engineering interpretation, probable causes, further tests and decisions reserved for the owner, designer, maker, class or flag.
MAKE IT ACTIONABLE
Use clear tables, annotated plots, location diagrams and prioritised findings. When results approach or exceed criteria, explain the next technical action.
QUALITY PRINCIPLES
Survey quality is the result of dozens of small, controlled decisions—from edition checks to field checks, naming conventions and review before issue.
COMMUNICATION-SURVEY REPORT CHECK
Before commissioning or remedial work is signed off, the evidence needs to answer the right question. A sound-level result can demonstrate audibility at a receiver; it does not by itself demonstrate that speech is understood.
For a PA/GA audibility and intelligibility survey, define the zones, receiver positions, background-noise condition and tested signal path. The report should identify whether the microphone and processing chain were included, which settings were used, and any untested areas. Use the PA/GA test-planning guide to prepare the scope.
For onboard reverberation and speech-intelligibility testing, connect each decay or STI result to its source/receiver positions, room configuration and operating condition. Keep calibration records, rejected measurements and limitations with the results. The RT/STI measurement guide explains the different diagnostic quantities.
Method is not acceptance: IEC 60268-16:2020, including its 2025 correction, describes STI methods; ISO 3382-2:2008 covers reverberation-time measurement in ordinary rooms. Neither supplies a universal vessel acceptance limit. Confirm the governing specification and authorised reviewer separately.
This is a report-review explanation, not a completed vessel case, calibration certificate or claim of class or flag approval.
START A TECHNICAL DISCUSSION
Bring us the decision, the vessel particulars and the operating matrix. We will help build a practical measurement plan around them.
