#423 TAHOE SPIRIT // Vessel Intelligence System

Intelligence Overview

TAHOE SPIRIT · MMSI 311000337 · 🏴 US · Primary Port: Philadelphia

PERIOD: JAN–DEC 2024

⚠ INTELLIGENCE ASSESSMENT: TAHOE SPIRIT ranks #423 of 69,461 monitored vessels with 41 anomalous detections across 8 months. Composite risk score: 0.9500 (CRITICAL). Active alert types: DARK_VESSEL, SPEED_ANOMALY, ZIGZAG.

Global Rank

#423

of 69,461 vessels

Composite Score

0.9500

CRITICAL

Total Detections

41

Months Active

8/12

Unique Ports

4

Dark Events

1

AIS blackout

Speed Anomalies

1

Max Speed

33.3 kn

Monthly Detection Volume

1
6

11
2

12
1

2
4

2024 MONTHLY DETECTIONS

Alert Type Distribution

ZIGZAG

11

DARK_VESSEL

1

SPEED_ANOMALY

1

Key Intelligence Findings

AIS Blackout Confirmed — 1 Event

Deliberate AIS transponder deactivation detected. Each event represents a period where TAHOE SPIRIT was operating outside electronic surveillance. Consistent with covert cargo transfer or evasion operations.

Velocity Fraud — 1 Speed Anomaly Events

AIS SOG field manipulated to broadcast physically impossible speeds up to 33.3 knots. Systematic falsification of movement data to corrupt automated tracking algorithms.

Evasion Navigation — 11 Zigzag Events

Erratic course-over-ground patterns up to 130.9° std deviation, far exceeding the 50° anomaly threshold. Pattern consistent with surveillance evasion maneuvers.

Port Detection Summary

🇺🇸

Philadelphia

7

avg 0.660

🇺🇸

Corpus Christi

3

avg 0.549

🇺🇸

Galveston

2

avg 0.800

🇺🇸

New Orleans

1

avg 0.530

Monthly Alert Log — All Months

Month	Detections	Severity	Score	Nearest Port	Alert Types
January 2024	6	MEDIUM	0.7448	Philadelphia	ZIGZAG; DARK_VESSEL
February 2024	4	MEDIUM	0.7135	Corpus Christi	ZIGZAG; SPEED_ANOMALY
May 2024	8	CRITICAL	0.9000	New York	ZIGZAG; SPEED_ANOMALY
June 2024	7	CRITICAL	0.9500	Galveston	ZIGZAG; SPEED_ANOMALY
August 2024	12	HIGH	0.8843	Philadelphia	ZIGZAG; SPEED_ANOMALY; POSITION_JUMP
September 2024	1	LOW	0.4112	Port Everglades	ZIGZAG
November 2024	2	HIGH	0.7773	Philadelphia	ZIGZAG
December 2024	1	MEDIUM	0.6433	Philadelphia	ZIGZAG

Activity Map

Detection events plotted · Color-coded by alert type · Drag to pan · Scroll to zoom

● Speed Anomaly ● Position Jump ● Zigzag ● Dark Vessel ● Rendezvous

Threat Intelligence

Analytical confidence: HIGH · Multi-indicator assessment

Threat Indicators Matrix

Indicator	Status	Evidence	Confidence
AIS Blackout / Dark Vessel	CONFIRMED	1 events detected	CRITICAL
GPS Spoofing / Position Jump	NOT DETECTED	—	LOW
Velocity Fraud / Speed Anomaly	CONFIRMED	1 events · max 33.3 kn	CRITICAL
Evasion Navigation / Zigzag	CONFIRMED	11 events · max COG std 130.9°	HIGH
Ship-to-Ship Rendezvous	NOT DETECTED	—	LOW
Multi-Port Operations	CONFIRMED	4 unique ports	HIGH

Operational Profile

Primary AO

Philadelphia and surrounding maritime zone

Active Period

8 months of continuous alert activity in 2024

Alert Density

41 detections across 13 individual events (avg 5.1/month)

Active Techniques

◐ DARK ⚡ SPEED ⟳ ZIGZAG

Threat Category

High-Confidence AIS Manipulation — Multiple confirmed evasion techniques

TTP Analysis

Tactics, Techniques & Procedures — Maritime ATT&CK Framework

MAR-T003

RTE-ANO-005

Evasion Navigation

Erratic COG changes exceeding 50° threshold (max 130.9°). Consistent with surveillance evasion or at-anchor AIS manipulation. Count: 11 events.

HIGH CONFIDENCE
11 events

MAR-T004

AIS-MAN-001

AIS Blackout

Deliberate AIS transponder deactivation to create surveillance gaps. Count: 1 events. Each event represents an unmonitored operational window.

HIGH CONFIDENCE
1 events

MAR-T001

RTE-ANO-001

Velocity Fraud

AIS SOG field manipulation to broadcast impossible speeds up to 33.3 kn. Corrupts automated tracking algorithms and creates false movement vectors. Count: 1 events.

HIGH CONFIDENCE
1 events

Risk Analysis

Composite risk scoring · Weighted indicator model · Quantus v2.4

Composite Score

0.9500

CRITICAL

Avg Detection Score

0.7530

Global Rank

#423

of 69,461 vessels

Weighted Indicator Scoring

Formula: (Dark×3) + (Rendezvous×4) + (PosJump×2) + (Speed×1) + (Zigzag×0.5) + (MaxScore×50)

Indicator	Count	Weight	Contribution
DARK_VESSEL	1	×3	3.0
RENDEZVOUS	0	×4	0.0
POSITION_JUMP	0	×2	0.0
SPEED_ANOMALY	1	×1	1.0
ZIGZAG	11	×0.5	5.5
MaxSingleScore	0.9500	×50	47.5
COMPOSITE TOTAL	Normalized [0,1]		0.9500 CRITICAL

⚡ Speed Anomaly Detections

Indicator: RTE-ANO-001 · 1 events · Max: 33.3 kn

AIS SOG FRAUD

Speed anomaly events are triggered when AIS Speed Over Ground (SOG) exceeds the 30-knot detection threshold. TAHOE SPIRIT reports speeds up to 33.3 kn — consistent with deliberate AIS SOG field manipulation to corrupt tracking algorithms.

Total Events

1

Max Reported SOG

33.3 kn

Indicator ID

RTE-ANO-001

Speed Anomaly Events (Top 50 by score)

Date	Max SOG (kn)	Score	Severity	Port	Coordinates

⟳ Zigzag / Erratic Navigation

Indicator: RTE-ANO-005 · 11 events · Max COG std: 130.9°

EVASION PATTERN

Zigzag events are triggered when course-over-ground (COG) standard deviation exceeds 50°. TAHOE SPIRIT records COG deviations up to 130.9° — consistent with surveillance evasion maneuvers or at-anchor AIS noise manipulation.

Total Events

11

Max COG Std Dev

130.9°

Threshold

50°

Zigzag Events (Top 50 by COG deviation)

Date	COG Std Dev (°)	Score	Severity	Port	Coordinates

◐ Dark Vessel Events

Indicator: AIS-MAN-001 · 1 AIS blackout events detected

AIS BLACKOUT

⚠ HIGH SIGNIFICANCE: Dark vessel events represent deliberate AIS transponder deactivation — a primary indicator of intentional surveillance evasion, covert cargo transfer, or sanctions circumvention.

Dark Vessel Events

1

Indicator

AIS-MAN-001

Risk Level

CRITICAL

◐ DARK EVENT #1 — 2024-01-11T15:06:57

AIS BLACKOUT

Location

38.1831°N, 74.3533°W — Philadelphia

AIS Gap Duration

7.1 hours

Pre-Blackout Speed

12.5 knots SOG

Displacement

111.2 NM from port during gap

Score

0.6051 · LOW

Assessment

AIS gap consistent with deliberate concealment.

Port History

4 distinct port areas · US primary flag state

Complete Port Detection Summary

Port	Country	Detections	Avg Score	Avg Dist NM	Risk
Philadelphia	🇺🇸	7	0.6599	62.3	STANDARD
Corpus Christi	🇺🇸	3	0.5489	21.9	STANDARD
Galveston	🇺🇸	2	0.8004	52.3	STANDARD
New Orleans	🇺🇸	1	0.5297	280.4	STANDARD

🇺🇸 Philadelphia — Port Profile

7 detections · Avg score 0.6599 · Avg distance 62.3 NM

LOW RISK

Total Detections

7

Primary port of operation

Avg Alert Score

0.6599

Avg Distance NM

62.3

Port proximity zone

Detection Types at Philadelphia

ZIGZAG

6

DARK_VESSEL

1

Coordinates: 39.952°N, 75.144°W

Port Intelligence Notes

Port Country

🇺🇸 US

Risk Classification

LOW — Standard port monitoring applies

Detection Share

7 of 13 total detections (53.8%)

Avg Distance from Port

62.3 NM — consistent with port proximity operations

🇺🇸 Corpus Christi — Port Profile

3 detections · Avg score 0.5489 · Avg distance 21.9 NM

LOW RISK

Total Detections

3

Secondary port

Avg Alert Score

0.5489

Avg Distance NM

21.9

Port proximity zone

Detection Types at Corpus Christi

ZIGZAG

3

Coordinates: 27.800°N, 97.396°W

Port Intelligence Notes

Port Country

🇺🇸 US

Risk Classification

LOW — Standard port monitoring applies

Detection Share

3 of 13 total detections (23.1%)

Avg Distance from Port

21.9 NM — consistent with port proximity operations

🇺🇸 Galveston — Port Profile

2 detections · Avg score 0.8004 · Avg distance 52.3 NM

LOW RISK

Total Detections

2

Secondary port

Avg Alert Score

0.8004

Avg Distance NM

52.3

Port proximity zone

Detection Types at Galveston

ZIGZAG

2

Coordinates: 29.301°N, 94.798°W

Port Intelligence Notes

Port Country

🇺🇸 US

Risk Classification

LOW — Standard port monitoring applies

Detection Share

2 of 13 total detections (15.4%)

Avg Distance from Port

52.3 NM — consistent with port proximity operations

🇺🇸 New Orleans — Port Profile

1 detections · Avg score 0.5297 · Avg distance 280.4 NM

LOW RISK

Total Detections

1

Secondary port

Avg Alert Score

0.5297

Avg Distance NM

280.4

Possible spoofed coords

Detection Types at New Orleans

SPEED_ANOMALY

1

Coordinates: 29.944°N, 90.063°W

Port Intelligence Notes

Port Country

🇺🇸 US

Risk Classification

LOW — Standard port monitoring applies

Detection Share

1 of 13 total detections (7.7%)

Avg Distance from Port

280.4 NM — anomalously high, suggests spoofed coordinates

Ownership Intelligence

MMSI registry · Flag state analysis · Beneficial ownership investigation

Vessel Name

TAHOE SPIRIT

MMSI

311000337

Flag State (MMSI-derived)

🏴 US

MID Code

311 → 🏴 US

Primary Port

Philadelphia

Detection Period

8 months (2024)

Registered Owner

Pending registry lookup

Beneficial Owner

Requires FinCEN CDD query

OFAC SDN Status

Pending cross-reference

Recommended Action

Physical inspection + full registry query

Vessel Type Analysis

AIS declared type · Physical capability vs. observed behavior

Type Mismatch Assessment

AIS Declared Type

vessel_type=37 (Pleasure Craft)

Behavior Consistency

Requires investigation

Speed Capability

Within or near physical limits for vessel type

Inspection Priority

HIGH — Recommend USCG/CBSA physical boarding and documentation review

Applicable Statutes

47 C.F.R. § 80.953 (AIS falsification) · 33 C.F.R. § 164.46 (AIS carriage) · 21 U.S.C. § 955 (maritime drug law)