Lost a ring or watch on Nantucket?

Do not go in after it, and tell us exactly which rocks. Brant Point, at the end of Easton Street, is where boats and ferries pass in and out of Nantucket Harbor, and local guides describe a strong current and heavy boat traffic there, with no lifeguard. A watch has plenty of metal in it, so it reads clearly once a detector is over it, but anything that fell into deeper water off the rocks needs someone in the water with an underwater detector. Send a photo of the exact spot you were standing on and the hour it happened.

On a Steamship Authority boat, call its lost and found on (508) 548-5011 extension 404. On a Hy-Line fast ferry, stop at any Hy-Line ticket office or call (800) 492-8082. If it went over the side at Steamboat Wharf or Straight Wharf, it is in harbour water, where a detector on the sand cannot reach. Tell us exactly where it fell and we will say honestly whether a diver makes sense.

Sometimes. Surfside has rolling surf over sandbars and a shallow sandbar at low tide, which is when the water's edge is easiest to work. Surfside is about 2.3 miles (3.7 km) from town by Surfside Road and has a lifeguard in season, so tell us which stand you were nearest and how far out you had waded. The sooner it is looked at the better, because waves on that shore move sand and bury things deeper.

Yes, an Oura ring is metal. The town describes Jetties as having gentle or no waves, little to no current and expansive sand bars at low tide. If the app shows a last location, send us a screenshot.

It can, and everything turns on how tightly you can place the spot. Great Point runs about 7 miles (11 km) north of Wauwinet to its lighthouse, reached on foot or by four-wheel drive along the sand, which is a very long stretch for anyone to cover without a mark to work from. Tell us how far up from Wauwinet you had gone, what you were level with when you last had it, and drop a pin if your phone caught one.

There is, and it is a harder shore than the north side. Madaket is at the west end of the island, known for its sunsets and for significant rip currents and heavy surf, and waves there move sand and bury things deeper, so time counts for more here than anywhere else on the island. Madaket has a lifeguard in season, so tell us which stand you were near, how far out you were and what the time was.

At whichever you can place more tightly, the playground side or the water's edge. Children's Beach, at 15 Harbor Way in town, has calm harbour water and a playground close by, with a lifeguard on the town's list, so it is flat, busy ground that a detector works easily once the area is small. A small stud gives a weak signal, so a narrow spot matters more here than the photographs do.

Tell us which way down to the sand you used. 'Sconset Beach is on the east end by the village of Siasconset, with a lifeguard in season, and the currents around the island change with the wind and the weather. The Sconset Bluff behind the beach is eroding, so the sand at the foot of it shifts, which makes the hour you lost it worth knowing as well as the place.