A six-digit code that removes ambiguity from a purchase order — and the situations where it will not help you at all.
If you have raised a requisition for ship supplies, you have met a six-digit IMPA code. If you have tried to use one to order a radar processor, you have also met its limits.
What the code is
IMPA is the International Maritime Purchasing Association, founded in 1974 by shipowners, suppliers and classification societies who were tired of the same item being described five different ways across four countries.
The code is the fix: a six-digit reference that identifies a ship supply item consistently, so a vessel, a buyer and a supplier are provably discussing the same thing on an RFQ, a quotation, a purchase order and a stock record.
Where it works well
The catalogue is strongest exactly where descriptions are most ambiguous and the items are most standardised:
- Deck and engine consumables
- Ropes, tools, safety equipment and provisions
- Fasteners, gaskets, seals and packing
- Cleaning and galley supplies
For these, quoting the IMPA code removes an entire round of clarification emails. It is genuinely faster.
Where it stops helping
The system classifies ship supply items. It was never designed to identify a specific revision of a specific manufacturer's electronic assembly.
Ask for a gyrocompass by IMPA code and you will get a category, not a unit. What decides whether a part will work on your vessel is:
- The manufacturer part number
- The model and revision of the equipment it fits
- What it is wired to — the interface, not the box
For bridge and engine-room electronics, the part number is the code that matters. IMPA will tell a purchasing system what budget line the item sits on. It will not tell an engineer whether the board will boot.
A practical rule
Use both, for different jobs.
- IMPA code for the purchasing system: classification, budgeting, stock records.
- Part number and photograph for the supplier: identification, compatibility, quotation.
Sending only the IMPA code for an electronics enquiry guarantees a reply that asks for the part number. Sending both gets a price.
If the code returns nothing
Plenty of equipment on an ageing vessel has no meaningful IMPA entry, particularly where the manufacturer has been absorbed or the item was a yard-fit special. That is not a dead end — it is a signal that the enquiry needs a part number and a photograph rather than a catalogue lookup.
Send us the plate and we will work from that.
Looking for a specific unit?
Send a model or part number. Most of what we ship never reaches the catalogue.