Vessel · Flag US
CGC WILLIAM SPARLING
CGC WILLIAM SPARLING is a vessel (MMSI 338926454, flag US). Its last AIS position was reported on 16 Oct 2026 at 18:33 UTC in Port of Boston, bound for BOSTON. AIS Trail recorded 2 port calls in the last 60 days, most recently at Boston.
Last position
Status: Moored · Destination as broadcast: BOSTON · ETA as broadcast: 3 Feb 2027, 06:00 UTC
Position of MMSI 338926454, rounded to 0.01°; see the exact live position and the last 3 days on the live map.
Vessel details
| Name | CGC WILLIAM SPARLING |
|---|---|
| IMO number | – |
| MMSI | 338926454 |
| Call sign | NWMS |
| Type | Other type |
| Flag | US (from the MMSI country code) |
| Length × beam | 46 m × 7 m |
| Highest reported draught | – |
| Estimated deadweight | – |
| Destination as broadcast | BOSTON |
| Seen in AIS | 10 Oct 2026 – 16 Oct 2026 (last 30 days) |
Port calls
Port calls detected by AIS Trail in the last 60 days, newest first.
| Port | Arrived (UTC) | Departed (UTC) | Time in port |
|---|---|---|---|
| Boston USBOS | 12 Oct 2026, 11:29 UTC | No departure yet | – |
| Woods Hole USWHO | 10 Oct 2026, 18:22 UTC | 11 Oct 2026, 15:05 UTC | 20 h 43 min |
CGC WILLIAM SPARLING in the API
The full track, every port call and the live position of CGC WILLIAM SPARLING are available through the AIS Trail API. A free key covers the last 7 days of history; paid plans cover the last 12 months, and Pro and Business add live positions.
curl -H "Authorization: Bearer $AIS_TRAIL_KEY" \
"https://api.aistrail.com/v1/vessels/338926454/track?from=2026-10-10&resolution=1h"
curl -H "Authorization: Bearer $AIS_TRAIL_KEY" \
"https://api.aistrail.com/v1/vessels/338926454/port-calls?from=2026-10-10"Sources
- Live AIS via aisstream.io, provided without warranty. No published terms
- Port reference: UN/LOCODE, United Nations Economic Commission for Europe (UNECE), https://unlocode.unece.org, license CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Modified: port entries selected, deduplicated and merged with the World Port Index.
- Port reference: World Port Index (Pub. 150), National Geospatial-Intelligence Agency (NGA).
Flags come from the MMSI country code, deadweight and size class are estimates from AIS dimensions, port calls are detected by AIS Trail from position reports. All sources and licences: Data sources.
Not for navigation. AIS data can be missing, delayed or wrong; do not use it for navigation, collision avoidance, search and rescue or any other safety-of-life purpose.
