•Tough, robust and attractive housing.
•Bed surface determination - weed, sand / gravel.
•Non-bottom contact indication - e.g. a fish.
•Protective bag included.
•Radio range approaching 300 metres.
•Maximum depth - 25 metres.
•25 hours use from one charge (10 hours use with back-light).
•Recharge in 15 hours.
•Bank-stick fixing or handheld.
•Rechargeable Nickel Metal Hydride battery built in (no memory effect).
•Battery condition indicator built in.
•Back-light for low light conditions.
•4 Zoom and speed levels.
•Scale in feet and Metres.
•6 Battery condition indicator levels.
•Weight 500g.
•Dimensions - 20cm x 11cm x 8cm.
•LCD - 128 x 64 pixels - Backlit Super Twisted Nematic.
•Video

Unlike the Smartcast which has a 90 degree beam, the Graphic Echo has a 20 degree beam angle allowing it to accurately map the bottom. It can pick out the important features which other systems cannot. The Smartcast can give you an average depth but this is about all it can do. If you're serious about feature finding then the answer is obvious...