Personally I leave it set to depth below keel, to which I add 1.5 metres for actual depth. There is a special corner of hell reserved for the person who then reset it to actual depth and did not tell me or put it back again! Fortunately I had already slowed right down thinking ... surprised there's this much water here as we came to a sudden stop.
Since lateral means side, multilateral means basically many-sided. The philosophy of multilateralism claims that the best solutions generally result when as many of the world's nations as possible are involved in discussions, and multilateralists often favor strengthening the United Nations.
A multilateral rate is the value of a currency against more than one other currency. Economists calculate multi-lateral rates to understand what is happening to the exchange rate, on average. This is achieved by using an index that reflects changes in one currency against a basket of other currencies.