Web alarm clock for 4:08 p.m.
You are wrapping up your check of the mangrove seedlings after the storm, noting any damage before you leave the site. Set the alarm for 4:08 pm so packing up does not slip past your planned departure. That still leaves a useful stretch before 5:00 pm for securing tools, recording which seedlings need another visit, and making sure nothing is left exposed.
Because the mangrove check may end in wind, rain, or conversation with other volunteers, choose a tone that matches those surroundings. A soft sound can mark the stopping point without startling everyone nearby, while a more insistent tone is easier to notice over rustling leaves and cleanup noise. Test the volume once before relying on it. Keep the alarm page active and the phone awake; otherwise, the mangrove reminder may not sound, leaving you at the site longer than intended.
Before leaving the mangroves at 4:08 pm, allow for slower afternoon travel on local roads, especially near school dismissal, town centres, or storm debris. Check the likely route while there is still daylight, then include extra travel time for pooled water or temporary diversions. If public transport is part of the trip, note the next departure before packing the phone away.