The ‘give way’ rules depend on what type of boat you’re in and the type of boat you’re approaching. If in any doubt, avoid a collision at all costs.
Make sure your actions are clear, taken in good time and do not take you close to other vessels. Ignorance of the rules is no excuse.
Overtaking - power boats and sail boats
All boats (sail or power) overtaking from astern are responsible for keeping clear until finally past the boat being overtaken. Always assume that the boat in front may not be aware of your presence or intentions.