Lowrance 600c 操作ガイド

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The three buttons along the left side of the Satellites screen indicate 

the quality of the units position lock. If 2D, 3D or WAAS is not high-

lighted the unit may not have a satellite lock. 

2D lock does not include your altitude. The unit must receive reliable 

signals from 3 satellites to establish a 2D lock. 

3D means the unit has achieved a more reliable lock, including not only 

your coordinate location but also your altitude (or elevation). The unit 

must receive reliable signals from 4 satellites to establish a 3D lock. 

WAAS means the GPS unit is receiving reliable correction signals from 

the FAA's Wide Area Augmentation System. WAAS is designed for use 

in aircraft, but occasionally terrestrial vehicles can attain a WAAS 

lock. This is the most accurate position signal available. 

The Estimated Position Error (EPE) represents the expected error from 

a benchmark location. If the EPE shows 50 feet, then the position 

shown by the unit is estimated to be within 50 feet of the actual loca-

tion. The smaller the position error number, the more accurate the sat-

ellites fix. 

The Satellite Display, located on the right side of the Satellites screen, 

is a circle that serves as a graphical view of the satellites overhead. 

Each satellite is shown on the circular chart relative to your position. 

The GPS receiver is tracking satellites that are in light blue type. The 

receiver hasn't locked onto a satellite if the number is in dark blue. 

The Satellites page shows your coordinates in latitude and longitude. 

These numbers can be used to pinpoint your location on any map or to 

create contacts at your position on another GPS unit.