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Sterling Asked: I assume the unit finds the signal itself and adjusts it self vertically also? Sterling, all satellite systems designed for mobile applications will find the satellite on their own. Here are the basic differences between systems: -- Some don't know which way the boat is aimed, so they initially need to know which direction the system is aiming. -- Some (typical RV systems) expect the sat TV system to be positioned level with the ground as they either don't have pitch indicator. -- Some are designed for static use. They will find the satellite when parked, but don't have the electronics and high speed servo motors to maintain satellite alignment underway. -- Some can maintain alignment with changes to azimuth, but not elevation. These may be marketed as being used while docked or achored. -- The most expensive units will have an external rate gyro and fast servos to maintain satellite alignment with simultaneous changes in azimuth and elevation (pitch and roll correction). -- Some have a single LNA/B, while others have multiple. -- Some are HD capable, others are not. -- Some are limited to a single system, typically DirecTV, while others will work on any satellite system. These single system units are typically the least expensive, smallest, and only require a single cable installation. The big names are KVH and SeaTel. Sea King is a relative newcomer to the marine environment that I know nothing about. Sea King does appear to be the price leader if you need/want HD, especially if you're a fresh water boater. They are the only provider that has different units for fresh and salt water applications, which seems pretty strange from a logistics support perspective. Gil ____________________________________________________________________________________ Be a better sports nut! Let your teams follow you with Yahoo Mobile. Try it now. http://mobile.yahoo.com/sports;_ylt=At9_qDKvtAbMuh1G1SQtBI7ntAcJ