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Use an ocean-observing map for buoys and an AIS vessel tracker for ships. For tropical-Pacific platforms, start with the Tropical Pacific Observing System (TPOS) interactive map. For Pacific Islands data and wave buoys, use PacIOOS Voyager. NOAA’s Global Drifter Program map covers drifting buoys worldwide, but its FAQ says the map is updated weekly rather than minute by minute. To find a named ship, search its name or identifier in an AIS service such as MarineTraffic, then read the position time and reception source. Satellite AIS extends offshore coverage, while terrestrial AIS is concentrated near coasts and ports. A marker is therefore evidence of a received report, not a guarantee of a ship’s exact present position.
Choose the map that matches what you are looking for
Buoys and ships broadcast different kinds of information. An observing-platform map catalogs instruments and their measurements; an AIS map displays vessel position reports from transponders. Starting with the wrong type of map is the most common reason a search appears empty.
| What you need | Best starting point | What it shows | Freshness or coverage qualification |
|---|---|---|---|
| Moored, tsunami, drifting and other tropical-Pacific platforms | TPOS Interactive Map | Platform locations, deployment details, sensor information and WMO IDs | Its description lists the platform types, but does not promise one universal update interval. |
| Pacific Islands observations and wave buoys | PacIOOS Voyager | Observations, forecasts, historical ocean data and island-region wave-buoy conditions | PacIOOS describes island wave-buoy conditions as near real time; availability varies by station. |
| Drifting buoys crossing the open ocean | NOAA AOML Global Drifter Program map | Global drifter-array positions | The FAQ says the location map is updated weekly. |
| A named cargo ship, yacht, research vessel or fishing vessel | An AIS tracker such as MarineTraffic | Vessel identity and received AIS positions | Terrestrial reception is coastal; satellite reception is broader but can be intermittent offshore. |
| Recent fishing-vessel activity and historical tracks | Global Fishing Watch | Recent AIS-based activity on an open-access map | Its FAQ says displayed AIS data reaches 72 hours before the present, so it is not an immediate-location service. |
Find buoy locations in the tropical South Pacific
Use the TPOS interactive map for the broadest platform inventory
The TPOS interactive map is the most useful first stop when your question concerns observing infrastructure rather than a vessel. Its scope includes moored buoys, tsunami buoys, drifting buoys, Argo floats, tide gauges, high-frequency radar and other observing platforms across the tropical Pacific. The map also provides access to deployment information, sensor details and WMO identifiers where those records are available.
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- Use the platform categories or map legend to distinguish a moored or tsunami buoy from a drifting buoy, float, tide gauge or radar station.
- Select an individual marker to open its station record. Record the station name, WMO ID, platform type and the listed deployment or sensor information.
- Follow the station’s data or metadata link when you need measurements rather than just a position. A marker can identify an instrument even when its latest observation is not available.
- Write down the map’s displayed observation time before treating a reading as current. TPOS identifies platforms and their metadata, but the page does not state one identical reporting interval for every instrument.
TPOS is especially useful for a regional overview: you can see how fixed tsunami or moored stations relate to island chains and open-ocean drifters before opening a station-specific data record. Do not interpret every symbol as a buoy. Argo floats, tide gauges and high-frequency radar are observing platforms too, and their data products differ from buoy measurements.
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Use PacIOOS Voyager for island stations and wave conditions
PacIOOS provides Voyager, a free interactive map for Pacific Islands observations, forecasts and historical ocean data. Its island-region wave buoys are described as providing near-real-time conditions, making Voyager a practical choice when you need wave height, period or direction near an island rather than a global inventory of every platform.
- Open PacIOOS and launch the Voyager map.
- Search or pan to the island, harbor or ocean sector. Turn on observation and wave-buoy layers if the map opens with a general layer set.
- Select a buoy symbol to view the station name, available variables and the latest plotted observation. Check the timestamp attached to the value, not only the marker’s presence.
- Switch to historical data when you need a trend or a past event. A historical series answers a different question from the latest observation.
- Use the forecast layers separately from observations. A forecast is a model prediction; it is not a live sensor report.
For American Samoa, the National Weather Service marine page links readers to PacIOOS and NOAA’s National Data Buoy Center for Aunuʻu and King-Poloa buoy information. Start at the American Samoa Marine page when those stations are your target, then use the linked station product to check its latest time and variables.
Check drifting buoys with NOAA’s global map
Drifting buoys move with currents, so a fixed-station map can make them appear to vanish when they have simply traveled outside the area you were viewing. The NOAA AOML Global Drifter Array map is designed for this open-ocean use case.
- Open the Global Drifter Array map and view the entire Pacific before narrowing the zoom. This helps you distinguish a missing marker from a drifter that has moved beyond the South Pacific window.
- Select a drifter to inspect its identifier and plotted position.
- Read the map date and time. The Global Drifter Program FAQ says the current location map is updated weekly.
- Use the drifter’s associated data record for measurements or a trajectory. Do not describe the weekly map as minute-by-minute live tracking.
A dated snapshot from NOAA AOML showed 1,133 buoys on September 14, 2026. That is the global drifter-array count shown in that snapshot, not a South Pacific-only total, and it can change as platforms are deployed, recovered or stop reporting. No current South Pacific-only buoy count is established by the cited sources.
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Find a ship with AIS
Search by name or an unambiguous identifier
For a named ship, open an AIS tracker such as MarineTraffic and search the vessel name or an identifier supplied by the owner, port, registry or tracker. A name can be shared by several vessels, so confirm the ship type, flag, dimensions or IMO/MMSI identifier in the result before opening the live map.
- Enter the vessel name, IMO number or MMSI in the tracker’s search field.
- Choose the result whose identity details match the ship you mean. Similar names and renamed vessels can otherwise lead to the wrong marker.
- Open the vessel detail panel rather than relying on the map dot alone.
- Read the position-received timestamp, course, speed and navigation status when supplied.
- Check whether the report came from a terrestrial receiver or satellite. That source explains much of the difference between a frequent coastal update and a sparse offshore track.
- Compare the report time with your question. A position received hours ago may be useful for a route estimate but is not proof of the ship’s position now.
MarineTraffic support states: “All vessels that are equipped with an operational AIS transponder and sail within the reception range of an AIS receiving station, installed on the shore, are depicted on the MarineTraffic Live Map.” The statement, attributed to Vasilis Kontas in a May 9, 2025 help article, describes a conditional feed: the transponder must be operational and within reception range. It does not mean that every ship in every part of the South Pacific is visible.
Understand terrestrial and satellite AIS
Terrestrial AIS uses receiving stations on land. It is strongest near ports, islands and coastlines where those stations can hear the vessel’s VHF transmissions. MarineTraffic’s explanation of terrestrial versus satellite reception notes that satellite AIS adds offshore reach, but remote-ocean reports can be separated by longer intervals and can contain reception gaps.
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| Reception source | Where it is most useful | What to expect in the South Pacific |
|---|---|---|
| Terrestrial AIS | Coasts, ports and waters near receiving stations | Often more frequent near islands and shipping approaches; it does not cover all open ocean. |
| Satellite AIS | Offshore routes beyond shore-station range | Broader geographic reach, but reports may be less frequent and gaps are possible in remote areas. |
Always use the tracker’s source label and received time together. A satellite position that is several hours old and a terrestrial position received moments ago are not equivalent, even if both appear as a single dot on the same map.
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Why a ship or buoy may be missing
A blank map does not establish that an object is absent. It can mean that the platform has moved, the receiver cannot hear it, the transponder is not transmitting, the service has not ingested a new report, or the map layer is filtered out.
- Outside receiver coverage: Terrestrial AIS is limited to coastal receiving stations. Large areas of the South Pacific are beyond shore-based range.
- Satellite reception gap: Satellite AIS improves offshore coverage but is not continuous everywhere. Remote-ocean reports can arrive at longer intervals.
- Stale vessel report: MarineTraffic says it removes a vessel from the live map after 24 hours without a fresh position. Removal is a display rule, not proof that the vessel stopped or disappeared.
- Inactive or absent AIS: A transponder may be switched off, malfunctioning or not required to transmit continuously in a particular situation. The cited tracker sources establish coverage conditions, not the reason for any individual silence.
- Map-layer or identity error: A buoy may be listed under a station identifier, while a ship may be listed under a former name or a different identifier. Recheck the station record or vessel details.
- Different platform type: A TPOS symbol might be an Argo float, tide gauge or radar site rather than a buoy. Turn on the correct category before concluding that no buoy is present.
When a marker is missing, record the last displayed time, source type and map scale. Then widen the geographic view, clear restrictive filters and search the identifier directly. Those checks separate a data problem from a legitimate coverage boundary.
Use Global Fishing Watch for recent activity, not live position
Global Fishing Watch is useful when your question is where fishing activity occurred recently or how a vessel track developed over time. Its open-access map is not an immediate ship locator: the service’s real-time FAQ says the AIS data displayed reaches 72 hours before the present.
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- Open the map and select the relevant vessel or activity layer.
- Set the date range to the period you want to examine.
- Read the end of the displayed track as the latest point available in that dataset, not as the vessel’s current position.
- For an immediate whereabouts question, cross-check the vessel in an AIS tracker and inspect its received timestamp and reception source.
The 72-hour boundary is a service-specific data limit, not a general rule for all AIS systems. It should be stated whenever you use Global Fishing Watch to explain a vessel’s recent movement.
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How to interpret buoy data once you find a marker
Identify the platform type
Platform type determines what a marker can tell you. A moored buoy remains at a designed station and is useful for local time series. A tsunami buoy is part of a warning-observation network. A drifting buoy moves with currents, so its position changes by design. An Argo float follows a programmed cycle and is not a surface buoy. Tide gauges measure water level at the coast, while high-frequency radar measures surface currents over an area.
Read metadata before values
Open the station record and note the WMO ID, deployment information, sensors and observation time. Two nearby markers can measure different variables, and a platform can remain visible after one sensor has stopped delivering a fresh value. Treat the location, instrument identity and measurement timestamp as three separate facts.
Separate observations, forecasts and history
PacIOOS combines observations, forecasts and historical ocean data in Voyager. Use the observation timestamp for what the instrument measured, the forecast timestamp for a modeled prediction and the historical date range for past conditions. Mixing those layers can make an old observation appear current or a forecast appear measured.
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Checking a wave buoy near an island
- Open PacIOOS Voyager and center the map on the island group.
- Enable wave-buoy observations and select the station marker.
- Read the latest timestamp and variables, then open the historical view if you need a trend.
- For American Samoa’s Aunuʻu or King-Poloa stations, use the links on the National Weather Service American Samoa marine page to reach the relevant PacIOOS or NOAA station product.
Checking an open-ocean drifter
- Open NOAA AOML’s Global Drifter Array map.
- Start with the whole Pacific, then zoom toward the drifter’s reported region.
- Select the drifter and record its identifier and plotted date.
- Because the FAQ describes weekly map updates, use the date as a freshness warning and avoid calling that position live.
Checking a container ship between island groups
- Search the ship by name, IMO number or MMSI in an AIS tracker.
- Confirm the identity details to avoid a same-name vessel.
- Read the latest received timestamp and whether the report is terrestrial or satellite.
- Judge the position against the source’s coverage: a recent terrestrial report near a port is generally more frequent than an older satellite report in open ocean, but neither alone guarantees continuous tracking.
- If no current marker appears, check the last report time and the service’s 24-hour live-map removal behavior before concluding anything about the ship’s whereabouts.
A freshness and evidence checklist
- Is this an observing-platform map or an AIS vessel map?
- What exact platform or vessel identifier did you select?
- What date and time is attached to the position or measurement?
- For a ship, was the report received by a terrestrial station or satellite?
- Is the map’s coverage coastal, regional, global or delayed?
- Could a filter, zoom level or platform category be hiding the marker?
- Are you viewing an observation, forecast or historical track?
- Does the service describe the result as live, near real time, weekly, or delayed?
Applying this checklist prevents the most serious interpretation error: treating a visible dot as a guaranteed, instantaneous location. TPOS and PacIOOS are strong entry points for Pacific observing platforms; NOAA AOML is the appropriate global drifter reference; AIS trackers are the route for named ships; and Global Fishing Watch is best reserved for recent activity and tracks with its stated delay.
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What the available counts do—and do not—tell you
| Figure | Scope and date | How to use it |
|---|---|---|
| 1,133 buoys | NOAA AOML global drifter-array map snapshot dated September 14, 2026 | Use as a time-specific global snapshot, not a current South Pacific total. |
| No South Pacific-only total | Not established by the cited sources | Do not infer a regional buoy count by subtracting or estimating from the global figure. |
| 24-hour live-map removal | MarineTraffic operational display behavior | A vessel can disappear from the live map after 24 hours without a fresh report; disappearance is not proof of absence. |
| 72-hour data boundary | Global Fishing Watch AIS display | Use for recent activity, not an immediate “where is it now?” answer. |
These numbers describe individual services and snapshots. They are not universal AIS laws, guarantees of continuous reception or a census of every buoy in the South Pacific.
When to use more than one source
Cross-checking is worthwhile when the decision depends on freshness or identity. Use TPOS to confirm that a buoy or other platform exists, PacIOOS to inspect island-region observations, and the station’s own timestamp to judge freshness. For a ship, use the AIS tracker’s detail page for the latest received position, then consult Global Fishing Watch only when you need the recent activity pattern. If the two displays disagree, compare their timestamps and data definitions before deciding that one is wrong.
For navigation, emergency response or scientific operations, treat these public maps as situational information rather than a substitute for official maritime communications, notices, or the vessel’s own operational systems. Public data can be delayed, filtered or interrupted even when the underlying instrument or ship is operating normally.
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