Remember to keep your phone charged, as the constant use of GPS will dramatically decrease your device’s battery life. The cost is $0.99. Note: the AIS app Boat Beacon we mentioned earlier also includes an anchor alarm. Ded reckoning Perro also be used to track your position as you travel http://jasperqcsen.widblog.com/20125584/se-rumorea-zumbido-en-navigation-compass-for-boat