3 min read
Your ship's PLC is discontinued. What happens next
A control system built around a PLC that no longer exists is a common position, not a crisis. How to identify what you have and what can replace it.
ReadNotes on marine equipment
What we learn buying, testing and shipping used bridge and engine-room equipment. Written for the people who have to keep it running.
- 3 min read
Marine light failures: what the rules require and what actually breaks
The regulations are specific about visibility, arcs and backup. Most failures are not the lamp. What to check, and what a port state inspector will look at.
Read - 3 min read
Why a ship's fire detection system keeps false-alarming
Repeated false alarms get systems isolated, and an isolated system is the real hazard. The usual causes, in the order worth checking them.
Read - 3 min read
Buying a used variable frequency drive: what to check
A drive can pass a bench power-up and still be nearly finished. The checks that tell you which one you are looking at.
Read - 3 min read
When the manufacturer stops supplying your bridge equipment
Discontinued does not mean unavailable. What actually happens when an OEM withdraws a part, and the three routes still open to you.
Read - 2 min read
IMPA codes: what they are, and when they actually help
A six-digit code that removes ambiguity from a purchase order — and the situations where it will not help you at all.
Read - 3 min read
Buying used marine electronics: an eight-point check
What to establish before you commit to a pre-owned bridge or engine-room unit — and which answers should make you walk away.
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