What feature is NOT characteristic of a coastal life raft?

A coastal life raft is primarily designed for the purpose of providing safety to individuals in maritime emergencies close to shore. While many modern life rafts may incorporate various features to ensure safety and functionality, double buoyancy tubes are typically not characteristic of coastal life rafts. Instead, coastal life rafts generally possess features that are suitable for short-term use in relatively calm waters, making them more simplified and portable.

The inclusion of an auto inflating canopy is a common characteristic designed to provide protection from the elements and increase survivability, particularly in offshore conditions. Coastal life rafts are also designed for quick recovery, allowing for efficient retrieval and reboarding in emergency situations, and they often come with a minimal amount of survival equipment suited for short-term emergencies, hence the option indicating 'little survival equipment' aligns with their intended use.