navionics is more detailed – Boating USA GPS map nautical offline fishing chart Review

I compared the watermap All US compared to the Navionics and the Navionics has much better detail on the Upper Mississippi. The can bouys show up on the Navionics central where as only the day markers show up on the Watermap. I think both are handy to have for reference and lets face it spending $5 to have a backup in the event primary navigation fails is priceless.
Review by Antennamatt on Boating USA GPS map nautical offline fishing chart.