As previously notified by HYDROPAC 303/10 and 337/10, mariners using ecdis are advised not to rely solely on…

Original warning text

ECDIS SYSTEM.
1. AS PREVIOUSLY NOTIFIED BY HYDROPAC
   303/10 AND 337/10, MARINERS USING ECDIS
   ARE ADVISED NOT TO RELY SOLELY ON
   AUTOMATED VOYAGE PLANNING AND MONITORING
   CHECKS AND ALARMS. IT IS RECOMMENDED
   THAT MARINERS UNDERTAKE CAREFUL VISUAL
   INSPECTION OF THE ENTIRE PLANNED ROUTE
   TO CONFIRM THAT IT, AND ANY DEVIATIONS
   FROM IT, IS CLEAR OF DANGERS. THE ECDIS
   DISPLAY SHOULD BE CONFIGURED TO DISPLAY
   ALL SOUNDINGS DURING THIS INSPECTION.
2. PARTICULAR CARE SHOULD BE TAKEN WHEN
   PLANNED ROUTES CROSS AREAS WHERE ONLY
   SMALL SCALE ENCS (USAGE BANDS 1 AND 2)
   ARE AVAILABLE. IN SOME DISPLAY
   CONFIGURATIONS, SUCH AS WHEN NO NAMES
   ARE SHOWN, SMALL ISLANDS AND OTHER POINT
   FEATURES MAY BE DIFFICULT TO IDENTIFY OR
   COULD BE OBSCURED BY SURROUNDING DEPTH
   CONTOURS. SOME ECDIS SYSTEMS APPEAR ONLY
   TO UNDERTAKE ROUTE CHECK FUNCTIONS ON
   LARGER SCALE ENCS AND THEREFORE ALARMS
   MIGHT NOT ACTIVATE. THIS MAY NOT BE
   CLEARLY INDICATED ON THE ECDIS DISPLAY.
3. THE INTERNATIONAL HYDROGRAPHIC
   ORGANIZATION (IHO) IS LEADING TECHNICAL
   ACTION TO INVESTIGATE THESE MATTERS IN
   CONSULTATION WITH ECDIS EQUIPMENT
   MANUFACTURERS. FURTHER INFORMATION WILL
   BE MADE AVAILABLE THROUGH NOTICES TO
   MARINERS.
4. THIS ERROR DOES NOT EFFECT DNC.