~ Captain Paul's response to: ~Pipeliner722 ~
I am sorry, but I believe that the only mapping for that unit is Humminbird Mapping and NavionicsPlus (+). See the specs on their web site at http://www.humminbird.com/Products/HELIX-5-SI-GPS/
Note that only the Navionics Plus edition mapping will work and not their Navoinics Premium or Platinum editions. I don’t think the Plus edition has all that you are looking for, so I suggest that you call Humminbird Support at 1-800-633-1468 see what they recommend.
After speaking to them, visit a stocking Humminbird that the mapping and view the selections in person.
Zoom in on the area you are interested and see it the selection meets your requirements.
Please let me know what you finally decide.
~ Captain Paul~