Surfers alarm - Surf's UP

"Surfrs alarm - Surf's UP" is an alarm clock app that can calculate the time of dawn and sunrise and set an alarm.
The location information is got at the place where the alarm is set, and the dawn and sunrise times at that location are automatically calculated.
The time of dawn and sunrise can be easily set to the alarm time with a button.
You can tune the alarm time with the plus and minus buttons. Plus and minus buttons can be adjusted in 1-minute increments by tapping and in 10-minute increments by tapping and holding.
The condition once set is memorized, so next time you can set the alarm with the same condition with one tap. For examle, 10 minutes before sunrise, 20 minutes after dawn, etc..
You can set the alarm sound and the number of repetitions in the settings.
If you can't get up easily, you should increase the number of repetitions with select a longer alarm sound.
The app does not need to be running in the background. If you set an alarm, it can playback an alarm even if the app is completely died.

Note:
This app requires location information. Cannot be used if location information getting is not allowed.
Use notification sound for alarm sound. If you don't allow notification, you won't hear an alarm sound.
For details, please refer on the support site. It can also be referenced from the app.