Good app but bad Canadian charts
I found the app about as easy to use as a typical dunderheaded chart plotter - easier than Raymarine but not as clear as a garmin.
The app allows you to track your position, plot routes, and generally look around a large chart collection reasonably easily.
However the expensive chart addons have only large-scale maps of the Canadian side of the Great Lakes. If you buy, you can look forward to one map for each of Huron, Erie, and Ontario.
stephen van egmond about
iNavX: Marine Navigation, v4.0.3