Ok thanks to all for the input. I've decided on a dedicated chart plotter Raymarine Dragonfly 5m.
The ipad was more money and you still needed the chart software.
I will report on the use of this neat new toy once I've installed and used it for awhile.
Oh, cost was $369 for the chartplotter only version (5m)
Regards,
Ken Gasparilla Marine, Placida Florida