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Maritime Safety Suite

Maritime compliance,
simplified.

For small operators, ports, and maritime professionals who need professional safety management without the enterprise complexity. Audit-ready from day one.

Start free trial — 30 days → Free PSC preparation tool
IMO MSC.255(84) aligned GISIS MSC-MEPC.3/Circ.4/Rev.1 ISM Code compliant
app.sentinelmss.com — Sentinel Investigate
✓
✓
✓
4
5
6
7
Step 4 of 7 — Casualty analysis
Accident event
03:42 — Grounding on shoal water
● VSMC
IMO investigation required
SHEL contributing factors
Fatigue Procedures not followed Alarm failure Poor visibility
Subject profile — OOW
Rank Officer of the watch
Time on duty 9h 10min ⚠
Rest — 24h 6.5 hrs
Watch pattern 6 on / 6 off
← Port
Save
IMO Casualty Investigation Code GISIS Reporting Schema ISM Code Compliance ISPS Code Security Port State Control Ready MARPOL Compliance UK Workboat Code SMS IMO MSC.428(98) Cyber IMO Casualty Investigation Code GISIS Reporting Schema ISM Code Compliance ISPS Code Security Port State Control Ready MARPOL Compliance UK Workboat Code SMS IMO MSC.428(98) Cyber
The challenge

When PSC boards, what do
you hand them?

Most small operators manage compliance with paper forms, Word documents, and spreadsheets. When an incident happens — or an inspector boards — they scramble.

📋
No structured records
Incident investigations written in Word from scratch. Drill records in a paper logbook. Certificates tracked in a spreadsheet that hasn't been updated. Port State Control sees this immediately.
⚖️
Growing regulatory pressure
UK Workboat Code requires SMS by 2026. NTSB recommending mandatory SMS for all passenger vessels. PSC scrutiny of smaller ships is increasing. Insurers requesting SMS evidence at renewal.
🔒
Enterprise tools don't fit
Maritime compliance software exists — but it's designed for large fleets with dedicated safety departments. Complex, expensive, and completely inappropriate for a small operator or marina.
The platform

Everything you need.
Nothing you don't.

Modular compliance tools built specifically for small maritime operators. Each module addresses a real regulatory requirement — guided workflows, professional outputs, audit-ready records.

Safety
Sentinel Investigate
Seven-step guided marine casualty investigation aligned with the IMO Casualty Investigation Code. SHEL analysis, five-whys, GISIS export, and professional Word report generation.
  • GISIS MSC-MEPC.3/Circ.4/Rev.1 aligned
  • Automated Word report with your branding
  • Email report delivery
  • Append-only audit trail
  • Photo and document evidence capture
From $199/year standalone
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Safety
Sentinel SMS
Safety Management System for vessels under 500 GT. Mini-ISM implementation covering safety policy, emergency procedures, risk register, and internal audit — without the bureaucracy of full ISM.
  • UK Workboat Code SMS compliant by 2026
  • Safety manual generation
  • Non-conformity and corrective action tracking
  • Internal audit toolkit
  • Emergency procedures library
Included in suite plans
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Safety
Sentinel Drills
Emergency drill scheduling, recording, and reporting. Fire, abandon ship, man overboard, medical emergency — every drill logged, every attendance recorded, every deficiency noted.
  • SOLAS drill requirement compliant
  • Overdue drill alerts
  • Formatted drill log for PSC inspection
  • Deficiency and corrective action tracking
  • Certificate of completion
Included in suite plans
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Cyber Security
Sentinel Cyber
IMO MSC.428(98) requires cyber risk management in your SMS. Sentinel Cyber guides you through identifying critical systems, assessing vulnerabilities, and building a documented Cyber Risk Management Plan.
  • IMO MSC.428(98) / MSC-FAL.1/Circ.3 aligned
  • System vulnerability assessment wizard
  • Maritime-specific threat library
  • Response and recovery plan builder
  • PSC cyber verification checklist
Included in suite plans
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Security
Sentinel Secure
Ship Security Plan generation and management. Full ISPS compliance for applicable vessels, and a scaled security plan for non-ISPS operators who want best-practice security documentation.
  • ISPS Code compliant for applicable vessels
  • Security plan generator
  • Declaration of Security management
  • Crew ID and vessel access logging
  • Security drill records
Included in Operator+ plans
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FREE
Free tool
PSC Preparation
Is your vessel ready for Port State Control? Work through our structured pre-inspection checklist covering documentation, equipment, crew competency, and SMS — then download your preparation report.
  • No account required
  • Covers all major PSC inspection areas
  • Traffic-light readiness status per area
  • Downloadable preparation report
  • Guidance on common deficiencies
Completely free — no signup
Use the tool →
Why SentinelMSS

The gap between paper
and enterprise.

SentinelMSS fills the space that has always existed between inadequate paper systems and unaffordable enterprise software.

Feature
Paper / Word
Enterprise software
SentinelMSS
Annual cost
Free
£10,000+
$199–$2,799
Maritime specific
—
✓ Large ships
✓ Small operators
IMO / GISIS aligned
—
✓
✓
Guided workflows
—
Complex, training needed
✓ No training needed
Audit trail
—
✓
✓
Professional reports
Manual formatting
✓
✓ Your branding
Works on any device
✓
Variable
✓ Mobile first
Cyber MSC.428(98)
—
Partial
✓
Regulatory alignment

Built around what
regulators require.

IMO MSC.255(84)
Casualty Investigation Code
Sentinel Investigate is built around the IMO Casualty Investigation Code. The seven-step workflow reflects the Code's methodology — from sequence of events through SHEL analysis to safety recommendations.
MSC-MEPC.3/Circ.4/Rev.1
GISIS Reporting Schema
All investigation data is structured against the GISIS five-appendix schema. GISIS export produces structured JSON ready for entry into the IMO GISIS MCI module by the flag state investigator.
ISM Code / SOLAS IX
Safety Management System
Sentinel SMS implements a mini-ISM aligned with the ISM Code for vessels under 500 GT and the UK Workboat Code SMS requirement mandatory from 2026.
IMO MSC.428(98)
Maritime Cyber Risk Management
Resolution MSC.428(98) requires cyber risk management in SMS documentation. Sentinel Cyber produces a Cyber Risk Management Plan aligned with MSC-FAL.1/Circ.3 and BIMCO guidelines.
ISPS Code
Ship and Port Facility Security
Sentinel Secure addresses ISPS requirements for applicable vessels and provides scaled security planning for non-ISPS operators in line with best practice guidance.
SOLAS / Flag State
Port State Control Readiness
The free PSC Preparation Tool guides operators through the key areas PSC inspectors examine — documentation, equipment, crew competency, SMS, and security — producing a readiness report before any port call.
Pricing

Transparent pricing.
No surprises.

All plans include Sentinel Investigate. Annual billing saves approximately two months versus monthly. All plans start with a 30-day free trial — no credit card required.

Solo
1 vessel — up to 2 users
$49
/month
or $449/year — save $139
  • Sentinel Investigate
  • Sentinel SMS (mini-ISM)
  • Sentinel Drills
  • 1 vessel or facility profile
  • 2 users
  • Email support
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Most popular
Operator
Up to 5 vessels — 10 users
$129
/month
or $1,199/year — save $349
  • Everything in Solo
  • Sentinel Secure (security plan)
  • Sentinel Cyber
  • Sentinel Crew
  • Up to 5 vessel profiles
  • 10 users
  • Priority email support
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Fleet
Up to 15 vessels — unlimited
$299
/month
or $2,799/year — save $789
  • Everything in Operator
  • Sentinel MARPOL
  • PSC preparation module
  • Up to 15 vessel profiles
  • Unlimited users
  • Phone and email support
Start free trial
Investigate
Standalone — professionals
$199
/year
No monthly option — always ready
  • Sentinel Investigate only
  • Unlimited investigations
  • 1 user
  • Full GISIS alignment
  • Word report generation
  • Ideal for surveyors and consultants
3 free investigations →

All prices in USD. +30% for Platinum (adds full Security, Environment, and MLC crew compliance domains). Contact us for Enterprise.

Free — no account required
Is your vessel PSC ready?
Work through our structured Port State Control preparation checklist — documentation, equipment, crew, SMS, and security — and download your readiness report.
Use the PSC preparation tool →
📡
Connectivity and offline use
SentinelMSS is designed for reliable operation across a range of connectivity environments. On stable connections the full workflow operates seamlessly. On intermittent connections, your work is automatically preserved locally so nothing is lost during brief dropouts. For operations requiring full offline capability — extended voyages, remote port facilities, or areas without reliable connectivity — contact us to discuss our offline-first deployment roadmap.

Ready to be audit-ready?

Start your free trial today. No credit card. No commitment. Set up in an afternoon.

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