Speed limits from four to six knots are in force in St Peter Port and St Sampson's harbours. A speed limit of six knots is in force in most of the bays around the coast of Guernsey and in the approaches to Herm and Jethou. There is also a speed limit of six knots off most of the bathing beaches in Herm and at Rosaire anchorage.
- All vessels, including jet skis, must be registered with Guernsey Harbours and must display registration numbers.
- All vessels, including jet skis, must have third party insurance cover.
- It is an offence to exceed a speed limit of more than 6 knots within the restricted areas.
- The speed limit within all harbours and marinas is 4 knots.