Mapping

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Well...

The Navionics Platinum is very popular BUT I can certainly testify that a lot of the stuff it has on the maps...ain't actually there. It will show a lot of bridges, road beds, etc...but most of it is not there. I think it's all there for eye candy. You can go to the Navionics website and view what their maps look like for the lakes. It's neat to look at...but I have pre-flood TVA maps that show road beds, bridges, etc...and the ones that Navionics shows, ain't even on the pre flood maps.

The LakeMaster is pretty good IF you have a lake that is in the HD directory for it. Example...in my area, Chickamauga Lake is an HD lake and the detail on it is incredible. Watts Bar Lake is not an HD...and it's OK. It's a step up above the internal map anyway.

Those are the only two I am familiar with. The Lowrance units have a couple extra you could choose from that I'm not sure we can run on the Bird...but out of those two, I would go with the LakeMaster if it will run on your unit.
 
I like the Navionics+ and Hotmaps Platinum, you basicly get a blank card then download any lake you like to the card until it is full. The new cards allow you to delete and add so you aren't stuck with lakes once the card is full like past versions.
The Platinum also has the "comunity edits" which are updates made by fisherman as they use their sonars every day, these give really detailed information.
Only down side to these is that once you purchase the card you have a one year subscription to add lakes and once that year is up then you have to purchase another year if you want to continue to get new updates...
Also you are no longer restricted to regions like the old cards, you can download a lake from any where in the country onto the same card.

IMO the maps of the Tennessee river are very accurate.
I use the card on a couple of HDS units as well.
 

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