Capture every relevant dimension
Beyond length overall, consider beam, draught, air draught, actual displacement and protrusions such as a bowsprit. Marinas and waterways do not always use the same measurement definition.
Verify the actual keel, rig and equipment variant. Antennas, wind generators, davits and retrofit platforms can change an individual boat’s limits.
Read berth conditions
An available berth is not automatically suitable. Resolve permitted dimensions, pile or box width, water depth, power, access, winter rules, insurance requirements and included services.
Annual, seasonal, visitor and winter rates are not directly comparable. Calculator values remain ranges; the marina’s actual quotation is the relevant basis.
Cruising area and water levels
Charted depth, gauges, tide, silting and local restrictions change usable depth. Keep margins and never rely on one nominal draught figure.
Bridges and cables demand the same care for air draught, including masthead equipment and loading. Use current official and local harbour information.
Simulate everyday use
Consider how often you will sail, fuel, lift or work on the boat in winter. Travel time, parking, facilities, yard access and parts availability shape actual use.
A smaller or shallower boat may increase reachable waters; more beam may add space while limiting berth choice. The finder exposes this trade-off but does not decide it for you.
Calculate limit and margin
Record three values for every constraint: verified boat dimension, published limit and chosen safety margin. Draught also depends on water level, waves, loading and silting; air draught includes masthead equipment and datum. The smallest remaining margin determines where local verification is required.
Manufacturer figures may vary by keel or rig option. Use the evidenced configuration of the actual boat, not the most convenient catalogue number. Unknown configuration remains an open item and the finder must not turn it into a confident match.
Verify before deciding
Obtain a written berth quotation with permitted dimensions, period, included services and termination terms. Then check current official chart and waterway information plus local harbour notices. Local experience can add context but not replace current limits.
Test the routine as well: travel, access in poor weather, lift and yard capacity, fuel and winter storage. A technically suitable berth may still be the wrong economic or operational base.
General information, not a survey or legal, tax or financial advice.
Primary sources and context
These sources support the general framework. The actual boat also requires its manufacturer documents, local rules and competent assessment.
- Regulations for pleasure craftMaritime and Coastguard Agency
Example of official, jurisdiction-specific guidance; use current sources for the actual cruising area.