Prince Charles and the Duchess of Cornwall begin their annual summer tour of Wales with a trip to the northern coast, where the Prince will be met by his son William at RAF Valley on Anglesey.
Flight Lieutenant Wales, as the Duke is known in the military, will show his father one of the Sea King helicopters he captains during search and rescue (SAR) missions and the SAR operations centre.
Charles, an honorary air commodore, will also meet his son's colleagues and have a private briefing from Station Commander, Group Captain Adrian Hill.
Today's other highlights include Charles and Camilla attending a thanksgiving service at the historic cathedral in St Asaph, which was granted city status by the Queen earlier this year to celebrate her Diamond Jubilee.
The couple will also officially open the new Bodnant Welsh Food Centre in the Conwy Valley.
The regeneration scheme includes a farm shop, tea room and restaurant as well as a cookery school and a dairy which makes cheese, ice cream and yoghurt from local milk. Also housed in the complex is the National Beekeeping Centre for Wales.
Today's events will conclude with a visit by the couple to Aberystwyth, where locals are still picking up the pieces after severe flooding last month.
The Prince and the Duchess will meet residents of the villages of Talybont, Dol-y-Bont, Llandre and Penrhyncoch, which were hardest hit by flood waters, together with members of the emergency services who provided vital assistance.
Later in the week, the royal couple will meet farmers, shopkeepers, hoteliers and other business leaders at a meeting of the Cambrian Mountains Initiative in Tregaron and open a new office for the Prince's Trust in Llanelli.