Where are you sailing? I've used
iNavX now for four years in
Canada, the
Caribbean,
Central America,
South Pacific and
New Zealand. Charts for the
USA are free I believe. Unfortunately it won't support CM93 and the only one for iPad's I believe was SeaIQ until they disabled support late last year.
Functionally,
iNavX has been good (and it integrates really well with Weather4D routing optimization), but I've had to completely wipe it and reload it twice during that time when it started to get 'buggy', then reload my charts. I've had to update my subscription each time in order to reload the charts which is REALLY frustrating and somewhat expensive.
So now I've picked up a
cheap Asus tablet (<$300 US) that runs Windows 10(?) and have loaded
OpenCPN on it. Now I can use both CM93 and
Google Earth .kap files. It also integrates with my Vesper
AIS perfectly so I get all my
AIS info in
OpenCPN also. The only drawback to the Asus tablet is that it doesn't have an internal
GPS, but since I've got the AIS it gets position from there anyway so it doesn't matter for me. A
cheap Bluetooth
puck GPS would also
work and you're still less than 1/2 the cost of an
iPad with cell capability.
When my
iPad dies, I'm not sure I'll be replacing it.