On Blue Sky we don't have a CHIRP system, but we do have a Simrad Structurescan and a Furuno 588 fish finder (the model has a letter or two ahead of the number but I'm not aboard so not sure).
The Structurescan is great to about 300'; we can look at wrecks, rocks (Ripple Rock is a fav) etc.
The Furuno is reliable to about 1000'; on occasion it has read to 1400'.
The Structurescan is a great tool for exploring and entertainment while the Furuno is a great fish finding and navigation tool.
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