Online alarm clock for 2:51 am
You are waking at 2:51 am with the Tongariro track and a sunrise start ahead, so the immediate job is to get properly out of bed. Setting the alarm for this exact time gives you nine minutes before 3:00 am to switch on a light, get dressed, and gather the gear prepared for the drive.
A pre-dawn Tongariro departure can unravel if the phone falls asleep before the alarm is due. Keep this page active, leave the device awake, and connect it to power if needed; if the browser closes or the device sleeps, the alarm for the track may not sound, leaving your departure without its planned prompt. Check that the volume is audible before putting the phone down.
Because you are heading onto New Zealand roads in the middle of the night, base your departure on the journey time rather than the alarm time alone. Check the route and current conditions, allow a buffer for slower dark-road driving, and confirm where you intend to park before setting off. At 2:51 am, an extra minute spent checking the route can prevent a wrong turn from eating into the time reserved for reaching the track near dawn.