ELECTRONICS CHARTS
Electronic Charts, formally known as Electronic Navigational Charts (ENCs), are official digital nautical charts approved by IMO and used in ECDIS. Under SOLAS Chapter V, ENCs provide real-time, accurate navigational information and are mandatory for vessels fitted with ECDIS, supporting safe and efficient navigation.
What is an Electronic Navigational Chart (ENC)?
An ENC is an official digital chart issued by or on behalf of a government hydrographic office and designed for use in ECDIS.
Are ENCs mandatory under SOLAS?
Yes. SOLAS Chapter V, Regulation 19 mandates the use of ENCs on vessels required to carry ECDIS.
Can ENCs replace paper charts?
Yes. When using type-approved ECDIS with up-to-date ENCs and backup arrangements, paper charts are not required.
Who approves ENCs?
ENCs are issued by national hydrographic offices and coordinated through IHO, making them IMO-recognized official charts.
How are ENCs updated?
ENCs are updated electronically via weekly or frequent updates, ensuring compliance and accuracy without manual corrections.
What is the difference between ENC and RNC?
ENC: Vector chart, SOLAS-approved, mandatory with ECDIS
RNC: Raster chart, scanned image, not accepted as primary navigation under SOLAS
What happens if ENC coverage is incomplete?
If ENC coverage is unavailable, official paper charts or RNCs (with approval) may be used temporarily as permitted by the flag administration.
How is ENC compliance checked during inspections?
PSC inspectors verify:
Valid ENC licenses
Latest updates applied
ECDIS performance and alarms
Backup navigation arrangement
Are ENC licenses required?
Yes. ENCs must be properly licensed for the vessel’s trading area and kept valid at all times.
What are the risks of using outdated ENCs?
Outdated ENCs can result in navigational errors, PSC deficiencies, detention, and increased accident risk
Conclusion
Electronic Charts (ENCs) are SOLAS-mandated, IMO-approved navigational tools for ECDIS-equipped vessels. Maintaining valid licenses, full coverage, and up-to-date corrections ensures regulatory compliance and enhances navigational safety.