The boat should be equipped with lifejackets, bailer, spare spark plugs and tool kit, flares and if you have one take a mobile phone. You will be offered a life jacket, you are strongly advised to wear it. The shock of falling in can stop you from breathing for a few vital momments. Let someone ashore know where you are going and at what time you expect to get back. Do not overload a boat.
Most lochs apply the international rules for the sea.
Keep well clear of other boats as line can be long. A 100 yard distance is best. Give way to non-motorized boats. If you are not familar with the water take a ghillie or guide for your first explorations and pick his brains. It is bad form to cut across drift of a boat which is loch style fishing.