I'd go with John. I put the furuno LS6100 on my proline this
season, and I am marking more fish than i ever did.
It is awesome.
It looks like the 4100 is basically the same unit.
~..~..~.. ><((((º>
Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.