The KMJC (Koninklijke Marine Jacht Club) access point is located at the Natte Dok in Den Helder, within the historic Rijkswerf Willemsoord complex.

The Natte Dok itself is a rectangular wet dock approximately 135 metres wide and 325 metres long, originally dug to a depth of around 8 metres, and forms the historical centrepiece of the former naval shipyard.

Vessels approaching from the Waddenzee can reach this area via the Zeedoksluis. After entering the Den Helder harbour, the KMJC and an adjacent restricted zone are left to starboard before heading toward the sluis.

An alternative route runs via de Rijkshaven and Het Nieuwe Diep through the Koopvaardersschutsluis, continuing through the Koopvaardersbinnenhaven and Maritieme Binnenhaven directly into the Natte Dok, where the marina is situated.