252 — Smm

If you mean , here’s the most common interpretation: 1. SMM = Ship Movement Message (IMO Standard) In shipping, SMM is an IMO standard message type for reporting vessel movements (part of the IMO FAL Forms or ship reporting systems). A “252 SMM” likely refers to a specific report code , but the IMO SMM format typically uses numbered fields, not “252” as a standard type.

It looks like you’re referring to — likely in the context of shipping, vessel operations, or maritime reporting . 252 smm