A pale sky layers a grey sea in the early hours of our first of two days en route to Angola. Thirty miles off the west coast of Namibia we steam north, leaving the solitude of the Namibian desert for the more well-populated countries to our north. It will take two days to cover the 744 nautical miles that lie between Walvis Bay, Namibia (our last stop) and our next, Lobito, Angola.

Even at sea the time passes quickly aboard National Geographic Explorer, with a full host of presentation slots to ingest, photographic workshops to attend, wildlife to search for and plenty of food to eat.

While the sea appears as deserted as the dunes of Namibia, it too can reveal life if you spend the time looking. Albatross, shearwaters, storm petrels and even an early whale made their presence known to the diligent onlooker (or captain). Gentle, well-spaced swells nudged us north and temperatures in the 70s presented perfect conditions to join the hotel staff on the back deck for a social mixer of wine and tapas later in the day.

With many miles and many countries to see on this epic adventure, these days at sea provide a well partitioned chance to process the places we have been and prepare us for the countries and cultures ahead.