VHF DSC
E746402
VHF DSC (Very High Frequency Digital Selective Calling) is a marine radio communication system that enables automated distress alerts and selective calling between ships and shore stations on VHF channels.
All labels observed (2)
| Label | Occurrences |
|---|---|
| VHF DSC canonical | 1 |
| Very High Frequency Digital Selective Calling | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8629417 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: VHF DSC Context triple: [Global Maritime Distress and Safety System, usesComponent, VHF DSC]
-
A.
VHF
VHF (Very High Frequency) is a radio frequency range from 30 to 300 MHz widely used for communication, broadcasting, and navigation systems such as the Gee navigation system.
-
B.
HF/DF
HF/DF is a World War II-era high-frequency direction-finding radio system used primarily by Allied navies to locate enemy transmissions, especially from German U-boats.
-
C.
LORAN
LORAN is a long-range terrestrial radio navigation system originally developed for maritime and aviation positioning before the advent of satellite-based GPS.
-
D.
TETRA
TETRA is a professional mobile radio and wireless communications standard widely used by public safety, emergency services, and critical infrastructure organizations for secure, reliable digital voice and data.
-
E.
COMINCH
COMINCH was the World War II-era title and abbreviation for the U.S. Navy’s top operational commander of the United States Fleet.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: VHF DSC Target entity description: VHF DSC (Very High Frequency Digital Selective Calling) is a marine radio communication system that enables automated distress alerts and selective calling between ships and shore stations on VHF channels.
-
A.
VHF
VHF (Very High Frequency) is a radio frequency range from 30 to 300 MHz widely used for communication, broadcasting, and navigation systems such as the Gee navigation system.
-
B.
HF/DF
HF/DF is a World War II-era high-frequency direction-finding radio system used primarily by Allied navies to locate enemy transmissions, especially from German U-boats.
-
C.
LORAN
LORAN is a long-range terrestrial radio navigation system originally developed for maritime and aviation positioning before the advent of satellite-based GPS.
-
D.
TETRA
TETRA is a professional mobile radio and wireless communications standard widely used by public safety, emergency services, and critical infrastructure organizations for secure, reliable digital voice and data.
-
E.
COMINCH
COMINCH was the World War II-era title and abbreviation for the U.S. Navy’s top operational commander of the United States Fleet.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Digital Selective Calling system
ⓘ
GMDSS component ⓘ maritime communication system ⓘ |
| channelFrequency | 156.525 MHz ⓘ |
| channelNumber | 70 ⓘ |
| dataRate | 1200 bit/s ⓘ |
| fullName |
Very High Frequency Digital Selective Calling
ⓘ
linked to:
VHF DSC
|
| geographicScope | sea area A1 ⓘ |
| introducedFor | automated and reliable distress alerting ⓘ |
| modulationType | FSK ⓘ |
| operatesOn | simplex channel ⓘ |
| regulatedBy | International Telecommunication Union ⓘ |
| relatedTo |
Inmarsat distress alerting
ⓘ
MF/HF DSC ⓘ |
| replaced | continuous voice watch on VHF Channel 16 for distress alerting on SOLAS ships ⓘ |
| requiresEquipment | VHF DSC-capable marine radio ⓘ |
| requiresIdentifier | Maritime Mobile Service Identity ⓘ |
| safetyRole | primary distress alerting method on VHF under GMDSS ⓘ |
| separates | distress and calling from voice traffic ⓘ |
| standardizedIn |
ITU-R M.493
ⓘ
ITU-R M.541 ⓘ
linked to:
ITU-R M.493
|
| supportsFunction |
automatic channel switching for voice follow-up
ⓘ
automatic distress relay ⓘ position reporting in distress alerts ⓘ time-stamping of distress alerts ⓘ |
| supportsMessageType |
all-ships call
ⓘ
distress acknowledgment ⓘ distress alert ⓘ geographical area call ⓘ group call ⓘ individual call ⓘ polling call ⓘ test call ⓘ |
| supportsPriority |
distress
ⓘ
routine ⓘ safety ⓘ urgency ⓘ |
| usedBy |
coast stations
ⓘ
ships ⓘ vessels subject to SOLAS ⓘ |
| usedFor |
automated distress alerting
ⓘ
routine calling ⓘ selective calling between ships ⓘ selective calling between ships and shore stations ⓘ urgency and safety calls ⓘ |
| usedIn | Global Maritime Distress and Safety System ⓘ |
| usesAddressing | MMSI numbers ⓘ |
| usesChannel | VHF Channel 70 ⓘ |
| usesEncoding |
CCIR 493-4
ⓘ
linked to:
CCIR
|
| usesFrequencyBand | VHF maritime mobile band ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: VHF DSC Description of subject: VHF DSC (Very High Frequency Digital Selective Calling) is a marine radio communication system that enables automated distress alerts and selective calling between ships and shore stations on VHF channels.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.