ELI5: Explain Like I'm 5

Harbour defence motor launch

A harbour defence motor launch is a type of boat that is used for guarding and protecting harbours. Similar to a security guard who keeps watch over a building, a motor launch keeps watch over harbours to make sure everything is safe.

The boat typically has a motor that powers it through the water and a small cabin that the people on the boat can use to stay out of the wind and rain. The cabin sometimes has windows so that the people on the boat can see everything around them and make sure there are no bad guys trying to sneak in.

The motor launch is often used by the Navy or Coast Guard, who will assign sailors or guards to patrol the harbour in the boat. These sailors or guards are trained to keep a lookout for any suspicious activity around the harbour or any boats that may be trying to enter illegally.

In summary, a harbour defence motor launch is a boat that is used to protect harbours and keep them safe from any harm or danger. It is a bit like a floating security guard that helps to make sure everything is alright in the harbour.