I've found
Navionics to be great in
Australia but their
charts are shockingly bad for the
Bahamas and for that matter
Florida. The Sonar
Charts cannot be trusted, I thought they were more accurate than the standard charts and thus ran us aground on a bank that showed over 2m
depth on the chart (we draw 1.3m). The
Garmin Bluewater App isn't as slick as the
Navionics but has much more accurate charts for the
Bahamas and tons of info from active
captain. For the
money having both is best!