the first and best anchor alarm for Android:- runs as a background task- can be controlled by SMS* from another phone- features unique anchor ‘projection’, user defined swing area, exclusion area and slack zone – text message alerts* with embedded Google maps URLs – silent or audible alarms, vibration and SMS*- vessel tracking (while running in foreground)- very low memory use and long battery life – automatic crash reporting- made by a professional software developer and MCA certified Yachtmaster.(*on devices that support telephony)visit http://www.slimjimsoftware.co.uk for full details.GPS accuracy and performance depends on your phone’s hardware. Please read the help page fully and make sure you understand how to tell if this application is running in the background and how to completely stop it. NOTE: some Android 4 devices using versions prior to 4.0.4 are known to be overly aggressive when shutting down background tasks, this interferes with Anchor Alert’s background function and causes it to be shut down after a couple of hours without warning. if you own one of these affected devices please contact your carrier about an upgrade to 4.0.4 or later, in the meantime you should only use foreground mode. Android versions 2.x and 3.x are not affected.Finally, please email me and let me know how I can make this app better for you before leaving negative feedback. My goal is a 5 star rating from everyone that buys this app, please help me achieve this!