Portable VHF radio
Regular walkie-talkies are very suitable for mutual communication on board. Also for security reasons, the use of walkie-talkies on board is in many cases very sensible.
The VHF walkie-talkies are portable VHF radios, on pleasure craft up to a maximum of 20 meters a walkie-talkie may be used instead of the fixed VHF on Dutch inland waterways. The fixed VHF radio is mandatory for ships longer than 20 meters.