First, I hope you got the 3G/4G enabled iPad so you have the GPS
chip and don't need to buy a separate GPS puck
. You don't need to buy a cellular service
to get GPS, but you do need the iPad with cellular hardware
. If you have wifi
only, consider going back and upgrading.
We use iNavX
as well and find it very easy to use. We use Navionics
charts with it which should be similar to what you're seeing on the Raymarine
. The iPad is our primary route
planner and our secondary chartplotter
underway. We haven't used the Navionic app, but that seems to be a viable alternative based on what others have said.
There are a number of threads on the topic of iPad nav apps. It's worth searching CF and deciding for yourself.