NautiK Dring software is usefull, innovating et sure, made by sailors for sailors.

NautiK Dring is only 2 €
(3€ on apple store or google play)
Get it from NautiK.Pro
or Android Market® or Samsung apps®

Get it by Apple Store®

from your ipad®
Ring each X minutes
Stop ring and reset by shaking throught the pocket
See GPS data
Record object azimut
Suitable for smatphone
Link to Google Maps®