HomeAppsProductivityAnchorSentinelApps like AnchorSentinel Here are some great alternatives to AnchorSentinel by Paul Lutus : Anchor Alert ★4.0 safeAnchor Anchor Watch Alarm ★4.3 Anchor Alarm - SailGrib AA ★4.0 Anchor Alarm ★4.6 Social Anchor Alarm ★5.0 Marine Navigation ★3.6 Marine Navigation Lite ★3.2 Anchor Watch / Alarm ★4.6 SailFreeGPS ★4.7 Aqua Map Boating ★3.3 Boatspeed ★4.1 Wavve Boating: Marine Boat GPS ★4.5 Digital Compass - GPS Compass ★4.1 Ship Tracker: Boat Tracker ★3.4 PortView ★4.6 Positional GPS, Compass, Solar ★4.5