#WaterSafety - The RNLI has posted the above video outlining what kayakers can do to call for help if they get into difficulty on the water.
Taking a whistle along for the trip is one sensible idea, as is ensuring a means of longer-range communication such as a VHF radio or a mobile phone in a dry case.
Carrying a flare may also prove handy, and there's always that old standby if other water users are within earshot - shouting as loud as you can to attract attention.