Why ecdis is a anti grounding tool why not anti collision?

• 1. Safety Frame/ Watch Vector is also known as ‘Anti Grounding Cone’ or ‘LookAhead Setting’. The setting is based on stopping distance and turning circle criteria of the vessel. Without proper setting of this feature, early warning of most of the navigational hazards in and around the vessel’s route shall not be available.

• 2. This feature does not provide alarms for ARPA and AIS targets.