HB units use the Navionics or the Lakemaster maps....
You will need 2 different Navionics cards for the lakes you mention...Illinois would be on the "East" card and Arkansas and Mississippi lakes would need the "South" card...
NAVIONICS: The Leader in Electronic Charts
The Lakemaster cards do not cover the lakes you mention...
LakeMaster Product Lake Lists for the LakeMaster Digital GPS map cards.
I would suggest you mount the unit at the position you would get the most benefit from it ...
If you plan on searching mostly with the big motor, mount the unit at the console...
If you plan on searching mostly with the TM, mount the unit at the bow
Rickie


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