General information about how this market works, not legal, regulatory, tax or financial advice. It does not indicate that Zeaclub maintains an office in Seattle. Requirements depend on the applicable authority, contract and jurisdiction, and change without notice.
Seattle at a glance
| Seattle | |
|---|---|
| Competent authority | United States Coast Guard, Sector Puget Sound |
| Compulsory pilotage | Puget Sound Pilots |
| Approach constraint | Long Strait of Juan de Fuca and Puget Sound transit; deep water throughout but a substantial pilotage passage |
| Port state control | USCG port state control regime (outside the MoU structure) |
| Register | US flag for domestic trades under the Jones Act; foreign flags in international trades |
| Principal ports | Terminal 5, Terminal 18, Terminal 30, Tacoma nearby |
| Currency | USD |
| Time zone | PST (UTC-8) / PDT |
What changes in Seattle
Sector Puget Sound covers a large waterway with commercial terminals, naval facilities and an international border nearby. The security geography is correspondingly broad, and the long transit means vessels are within the zone for many hours before reaching a berth.
The Alaska trades add a distinctive element: US-flag domestic services crewed by TWIC-holding mariners operate alongside international calls, and the seasonal rhythm of those services shapes terminal activity through the year.
- Sector Puget Sound covers a broad waterway with mixed commercial and naval facilities.
- Proximity to an international border adds a coordination dimension.
- The long transit keeps vessels inside the zone for many hours before berthing.
- US-flag Alaska services operate with TWIC-holding crews alongside foreign callers.
- Northwest Seaport Alliance terminals span two harbours under one broad posture.
MTSA in Puget Sound
| Element | Local position |
|---|---|
| COTP zone | USCG Sector Puget Sound |
| Geography | Broad waterway with commercial and naval facilities |
| Border | International proximity adds coordination |
| Transit | Many hours inside the zone before berthing |
| Domestic trades | Alaska services with TWIC-holding US crews |
The Seattle cluster
Seattle operates with Tacoma as the Northwest Seaport Alliance, sharing container volume across both harbours. The approach is deep but long — a substantial transit from the Strait of Juan de Fuca — and the port is the principal US gateway for Alaska trades, which run under the Jones Act and have their own seasonal rhythm.
- Northwest Seaport Alliance with Tacoma
- Principal Alaska trade gateway
- Deep water with no draft restriction
- Transpacific and Asian services
The fundamentals
After 2001 the IMO produced the ISPS Code, and the United States passed the Maritime Transportation Security Act in 2002. The two were developed in parallel and are broadly aligned, but the US did not adopt ISPS as its domestic law. It wrote its own, in 33 CFR Parts 101 to 106.
The practical consequence is that in a US port you are inspected against the Code of Federal Regulations, not against the ISPS Code. Most of the substance matches. The vocabulary, the thresholds and the enforcement do not.
This is the shared explanation, common to every market. The full treatment is in MTSA Explained: How US Port Security Actually Works.
Frequently asked questions
Does the long transit affect security obligations?
It extends them. A vessel is inside the COTP zone for many hours before reaching a berth, so reporting and security zone obligations apply across the passage rather than only at the terminal.
How do Alaska trades fit in?
They are US-flag domestic services under the Jones Act, crewed by mariners holding TWIC. They operate alongside international calls at the same terminals, with quite different credentialing positions.
Primary sources
- United States Coast GuardAccessed 2026-08-30
- USCG Office of Commercial Vessel ComplianceAccessed 2026-08-30