It is possible to build systems that link this automatically into a purchasing network, linking directly into the suppliers' computer systems. An example is Wallem's set up with Arena. The Arena system connects directly into Wallem's internal IT system, distributing purchase requirements directly to suppliers and returning quotes for comparative purposes. 1Sea takes the concept a step further by setting up systems for purchase from the ship. The software allows the vessel to connect with 1Sea's terrestrial purchasing network, communicating over Inmarsat or whatever satellite network might be available, reducing the amount of data which needs communicating to the absolute minimum.
Many shipping companies are reluctant to allow seafarers to make purchases from onboard vessels.
This is essentially a control thing. They do not think seafarers can be trusted with budgets, or they do not think they are up to the job. This reluctance to give seafarers more control is unfortunate. Anyone with the slightest experience of how the internet affects business will know that its first affect is to decentralise the old power structures, normally with surprisingly good results. For example, we hear stories about how corporate staff are allowed to book their own flight tickets on their intranets rather than having to go through a company travel agent and everybody saves a great deal of money in the process.