Apps like AnchorSentinel

Here are some great alternatives to AnchorSentinel by Paul Lutus :
Anchor Alert
Anchor Alert
★3.8
safeAnchor Anchor Watch Alarm
safeAnchor Anchor Watch Alarm
★4.3
SailDroid
SailDroid
★4.6
Anchor Alarm
Anchor Alarm
★4.6
Social Anchor Alarm
Social Anchor Alarm
★5.0
Anchor Alarm - SailGrib AA
Anchor Alarm - SailGrib AA
★4.0
Marine Navigation
Marine Navigation
★3.6
Anchor Watch / Alarm
Anchor Watch / Alarm
★4.6
SailFreeGPS
SailFreeGPS
★4.7
Aqua Map Boating
Aqua Map Boating
★3.3
WatchMate
WatchMate
★3.3
Boatspeed
Boatspeed
★4.1
Wavve Boating: Marine Boat GPS
Wavve Boating: Marine Boat GPS
★4.5
Digital Compass - GPS Compass
Digital Compass - GPS Compass
★4.1
Ship Tracker: Boat Tracker
Ship Tracker: Boat Tracker
★3.4
PortView
PortView
★4.6