An ISSA code is an item reference number from the Ship Stores Catalogue published by the International Ship Suppliers and Services Association (ISSA). Like the IMPA system, it exists so that vessel buyers and ship suppliers can identify the same store item precisely, rather than relying on free-text descriptions that are easy to misread. ISSA represents ship supply associations and member chandlers around the world, and its catalogue is one of the two coding standards, alongside IMPA, that the ship supply trade uses day to day.
ISSA codes and IMPA codes
ISSA and IMPA are separate catalogues, each with its own numbering scheme, and both are widely recognised. Some buyers standardise on one; many operate with both, because a given item may be listed in each. In practice, suppliers frequently cross-reference between ISSA and IMPA so that an item requisitioned under one system can still be found, quoted and delivered without confusion. Handling both coding systems is therefore a practical requirement for chandlers serving a broad customer base.
Why ISSA codes matter
The value of an ISSA code is the same as any shared identifier in procurement: it turns an ambiguous description into a definite item. When a requisition line carries an ISSA code, the chandler prices the exact product the vessel intended, the delivery note lists the same item, and the invoice reconciles against the original order. Coded lines also allow buyers to compare competing quotes fairly, because each supplier is pricing an identical, uniquely identified item.
ISSA codes in a digital workflow
Resolving free-text requisitions to ISSA codes by hand is time-consuming, especially on large orders with hundreds of lines. Modern maritime procurement software automates this: it interprets the incoming request, maps each line to its ISSA or IMPA code, and routes anything uncertain for review. Accurate coding is what lets the rest of the RFQ-to-quote process run quickly and without downstream disputes.
Using ISSA codes across borders
Because ISSA represents ship supply associations and chandlers across many countries, its codes are recognised internationally, which is exactly what cross-border ship supply needs. A vessel may be crewed by people who share no common first language and supplied by a chandler in a country neither the owner nor the crew is based in. A shared code, backed by a catalogue entry, lets all of them refer to one definite item, so quoting, supplying and invoicing stay consistent no matter where the port is.
