What depth range can the Is0091 display?

The depth sounder displays depth from 3–199 feet, 1–92 meters, or 1–54 fathoms. To allow greater depths in feet mode, it will automatically switch to fathoms mode and display depths up to approximately 54 fathoms, returning to feet mode when depth decreases below 200 feet. Extreme depths may be limited by the type of transducer used or bottom conditions. (Page 2–3)