Depending on your browser program, your ship is assessed according to various parameters and its references. A diagnosis is made by taking into account the condition of the vessel, its maintenance, its history. If you stand as a buyer, the expert will advise you on your purchase; identify anomalies, and establish you an expert report stating the fault back by the seller before the transaction. This can avoid unpleasant discoveries that will cause an additional cost to your purchase. Note that this kind of expertise is often requested by insurance companies for vessels 10 years and over.
Position of seller, your ship will be measured at fair price, ensuring a quicker sale with the support, a survey report will be likely to give more confidence to your buyer.