Reference Cards
Quick-reference cards for on-water use. Print any card for your chart table.
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The Chartroom — chartroom.onlineVHF Channel Reference
Critical Channels
16Distress, Safety & Calling — monitor at all times
70DSC digital distress only — NO voice
13Bridge-to-bridge navigation (1W)
9Recreational boater calling / marinas
22AUSCG working channel (after contact on 16)
6Intership safety
21A / 83AUSCG operations
WX-1–WX-9NOAA weather broadcasts
Radio Procedure
MAYDAYLife-threatening distress — repeat 3×
PAN-PANUrgency — repeat 3×, not life-threatening
SÉCURITÉSafety — navigational hazard, repeat 3×
DSC DistressPress red button → sends MMSI + GPS on Ch 70
MAYDAY Call Format
MAYDAY MAYDAY MAYDAY
This is [vessel name × 3]
MAYDAY [vessel name]
Position: [GPS or landmark]
[Nature of distress]
[Number of persons]
[Vessel description]
OVER
This is [vessel name × 3]
MAYDAY [vessel name]
Position: [GPS or landmark]
[Nature of distress]
[Number of persons]
[Vessel description]
OVER