Apps like OpenCPN

Here are some great alternatives to OpenCPN by Dave Register :
i-Boating:Marine Navigation
i-Boating:Marine Navigation
★4.2
NavMonitor
NavMonitor
★5.0
Weather - Routing - Navigation
Weather - Routing - Navigation
★4.5
Pro Weather Routing Navigation
Pro Weather Routing Navigation
★4.8
Imray Navigator
Imray Navigator
★3.8
mKart Marine Navigation
mKart Marine Navigation
★3.4
Simrad: Companion for Boaters
Simrad: Companion for Boaters
★4.0
NV Charts GPS Navigation AIS
NV Charts GPS Navigation AIS
★3.3
AIS Flytomap GPS Chart Plotter
AIS Flytomap GPS Chart Plotter
★4.4
Garmin ActiveCaptain®
Garmin ActiveCaptain®
★4.0
NetGPS
NetGPS
★4.1
C-MAP Boating
C-MAP Boating
★3.9
Memory-Map
Memory-Map
★3.7
Navigraph Charts
Navigraph Charts
★4.7
Marine Navigation Lite
Marine Navigation Lite
★3.2
GPX Viewer
GPX Viewer
★4.3