Within 300 metres of the coast, the speed limit is 8 knots. Motorboats and jet-propelled craft may only begin planing outside this zone. Boat length, bathing areas, ports and local rules also determine the required distance.
Three numbers answer three different questions
Three rules on Croatia's coast are often compressed into a single sentence. The 300-metre zone specifies where all vessels may travel at no more than 8 knots. The planing rule says that motorboats and jet-propelled craft may only begin planing more than 300 metres from the coast. Minimum-distance rules additionally determine how close a vessel may approach the coast, depending on its length.
Merely watching the speedometer may therefore still leave you in breach of the rules. Under certain conditions, a small boat may approach within 300 metres of the coast, but it must remain slow and may not plane there. A large vessel generally has to stay farther offshore. Ports, bathing zones, diver-down signals and local prohibitions impose further limits.
Within 300 metres: no more than 8 knots
Article 50 of Croatia's maritime safety regulations limits all vessels to a maximum of 8 knots within 300 metres of the coast. The same limit applies in narrow channels and on approaches to ports and anchorages. Particular care is required so that manoeuvres and stopping can be completed in time.
Eight knots is approximately 14.8 kilometres per hour. It is a ceiling, not a target. In a narrow bay, among swimmers, near a harbour jetty or in poor visibility, even 8 knots may be too fast. Collision avoidance and consideration for others always require a safe speed suited to the actual conditions.
Planing only begins beyond the 300-metre line
Under the same provision, motorboats and jet-propelled craft may only plane at a distance of more than 300 metres from the coast. The rule does not apply only to jet skis. An ordinary rental or charter motorboat also breaches it if it climbs onto the plane within the zone and runs quickly across the water with its hull lifted.
The vessel's actual mode of travel is decisive, not what the boat is called. Planing is recognisable from the markedly altered hull attitude, higher speed and stronger wake. If unsure at roughly 300 metres, continue a little farther offshore and accelerate only there, provided the chart, traffic, weather and local restrictions allow it.
The coastal rule for motorboats, charters and jet skis
Graphic showing the 300-metre zone, the 8-knot speed limit, the point beyond which planing may begin and minimum distances based on vessel length
Minimum distances depend on vessel length
Outside special situations, ships and vessels 30 metres or longer must generally remain at least 300 metres from the coast. Vessels from 15 to under 30 metres must keep at least 150 metres away. Vessels under 15 metres may generally approach to within 50 metres. These figures describe distance from the coast, not permitted speed.
A six-metre motorboat may therefore approach to within 50 metres of the coast in a suitable bay, but throughout the entire 300-metre zone it remains limited to 8 knots and may not plane. The 50-metre rule is not an invitation to pass close to rocks, swimmers or anchored boats at 8 knots.
Entering and leaving is permitted, but only slowly
A boat must be able to reach the coast to enter a port, berth, anchor or leave a mooring. The regulations therefore provide exceptions to the general minimum distances where entering or leaving, local geography or the intended berth makes them necessary. This does not create a licence for a high-speed approach.
In such situations, speed must be reduced enough for the vessel to manoeuvre and stop quickly. The shortest safe route offshore is the sensible course: warm up the engine, keep a lookout, watch the wake and accelerate only after leaving the 300-metre zone. Ports may in any case have lower limits displayed locally.
Bathing areas shift the reference point
At marked and delimited bathing areas, distance is not measured simply from the dry shoreline. Ships 30 metres or longer must stay at least 300 metres from the boundary of the bathing area, vessels from 15 to under 30 metres at least 100 metres away, and smaller craft at least 50 metres away. Motorboats do not belong inside the bathing area itself.
Even at a beach that is not enclosed by buoys, the skipper must expect swimmers. Small buoys, air mattresses and snorkellers are difficult to see against the light. Formal distance therefore replaces neither a lookout nor a slow, wide passage. Bathers may swim far beyond the visible edge of the beach.
Divers, ports and local prohibitions take precedence
A distance of at least 50 metres must be kept from a clearly visible diver-down signal. In practice, more distance is often sensible because divers do not necessarily surface directly beneath the flag. Slow down, alter course early and never pass between the support boat and flag or through an identifiable group of divers.
Harbour masters may impose stricter rules for individual bays, channels, ports or heavily used areas. Protected areas, national parks and concession zones may have additional navigation and anchoring restrictions. The nationwide 300-metre rule is therefore the framework; charts, notices, signs and local orders complete it.
How to estimate 300 metres on the water
From the cockpit, 300 metres often looks shorter than it is. A useful guide is the chart or plotter distance to the nearest coastline, not the distance to a port, holiday home or the nearest visible headland. In a curved bay, the shortest distance to any point on the coast is what counts.
GPS and plotters are aids, not a magical boundary line: chart accuracy, scale and antenna position all create uncertainty. Anyone intending to accelerate should add a safety margin. A rental boat without a plotter is not exempt; a chart app, paper chart, briefing from the rental company and a deliberately generous distance are then part of proper preparation.
Inspections show that the rule is enforced
During the Safe Navigation 2026 operation, authorities in the Šibenik area inspected 30 ships and vessels on 20 August. Five of the eight detected offences involved unlawful speed or planing. According to the ministry, fines totalling €4,580 were imposed.
During a joint inspection on Krk in June, police also recorded four cases of planing within 300 metres. These are not comprehensive statistics for the entire Adriatic, but they demonstrate the rule's practical relevance. Harbour authorities and police check compliance during normal summer operations, not only after an accident.
56 offences do not mean 56 cases of planing
Split-Dalmatia maritime police penalised a total of 56 different maritime-traffic offences between 31 August and 7 September. Of these, 15 involved unlawful planing in prohibited areas or within 300 metres of the coast. Police state a fine of €400 for each of those 15 cases.
The remaining 41 cases must not subsequently be recast as speeding offences. According to police, they mainly concerned unlawful anchoring, overloading and missing certificates of competence, insurance or vignettes. The tally also applies only to the stated period and the Split-Dalmatia jurisdiction—not to the whole Croatian Adriatic.
The simple cockpit rule
Close to the coast, keep the hull in the water: travel slowly, remain alert and do not plane. Accelerate only once you are certainly more than 300 metres away, no bathing, port, diving or conservation rule prevents it, and traffic and weather conditions are suitable. On the return, ease off the throttle well before entering the 300-metre zone, not just before the jetty.
This routine is easier than debating estimated metres after an inspection. It protects swimmers, paddlers, divers, small boats and your own crew from wake and restricted reaction time. The 300 metres are not bureaucratic harassment, but the transition between the coastal area and high-speed travel.
Evidence
Sources & date
Sources support the facts. Planning notes and recommendations are Golden Beach editorial assessments.
- Pravilnik o sigurnosti pomorske plovidbe u unutarnjim morskim vodama i teritorijalnom moru Republike HrvatskeNarodne novine · NN 52/2025, checked 23 August 2026Articles 49 and 50 on distances from the coast and bathing areas, 8 knots, planing, entering and leaving, diver-down signals and stricter local rules
- Održana akcija Sigurna plovidba 2026 – ŠibenikMinistry of the Sea, Transport and Infrastructure · 20 August 2026number of inspections, five speed or planing offences and fines imposed in the Šibenik area
- U pomorskom prometu tijekom proteklog tjedna sankcionirano ukupno 56 prekršajaSplit-Dalmatia Police Department · 7 September 202656 penalised maritime-traffic offences from 31 August to 7 September, including 15 planing offences fined at €400 each
- Međuresornom suradnjom policije i Porezne uprave utvrđeni pomorski i prekršaji fiskalizacijePrimorje-Gorski Kotar Police Department · 20 June 2026four recorded cases of planing within 300 metres during an inspection on Krk
