Applies to: Furuno FELCOM20 · OME-55810-A1 · 2026-01-23
Work through these checks
Furuno FELCOM20 Inmarsat-C · OME-55810-A1
Match FELCOM20 and OME-55810-A1, 23 January 2026; do not use FELCOM19 keyboard procedures. Record Dashboard Signal Strength, Frame Sync, Current Status, GNSS Status and active alert IDs. SYNC (NCS) or Retuning is not the same as successful login or delivered mail; IDLE can be normal. For UNSYNC lasting over five minutes, record the configured ocean region and the installed ANT versus GNSS ANT connection: those connectors serve different systems. Do not disconnect or change them as a test. A touchscreen that cannot select a menu may have another hand, object or dirt on it; that alone does not prove lost satellite reception. Preserve messages/settings. No PV, distress or SSAS tests, reset, alert clearing, firmware or wiring changes; use qualified marine service.
When to stop and get help
Do not continue these checks in unsafe conditions. For immediate danger, use local emergency services and the device’s emergency instructions. Otherwise, contact your provider or a qualified technician.
What to tell support
Write down your exact model, service provider and on-screen message. Photograph the existing connections for your own reference before changing anything. Furuno FELCOM20 · OME-55810-A1 · 2026-01-23
Original troubleshooting guidance based on the official sources below. Menu names can change. This is an independent guide, not a manufacturer service bulletin or a bench-tested repair.