2D Navigation status indicates that at leastthree satellites with good geometry have beenlocked onto and a 2 dimensional position fix(latitude and longitude) is being calculated. ‘2DDiff’ will appear when you are receiving DGPScorrections in 2D mode.3D Navigation indicates that at least four satel-lites with good geometry have been locked ontoand your position is now being calculated in lat-itude, longitude and altitude. ‘3D Diff’ will appearwhen you are receiving DGPS corrections in 3Dmode.Searching the Sky indicates that the GPS 40 iscollecting new almanac data or AutoLocateTMmode has been selected (see page 38). Thisprocess can take 7.5 to 15 minutes.Poor GPS Coverage indicates that the receiveris no longer tracking enough satellites to providea 2D or 3D position fix.Simulating Navigation indicates that thereceiver is in simulator mode.Below the receiver status field and to the left ofthe satellite sky view is the battery level indicator.The battery level indicator is calibrated for alka-line batteries. Ni-Cad and lithium batteries will notaccurately display the battery level due to voltagedifferences. No other receiver functions areaffected by using Ni-Cad or lithium batteries.On the right side of the screen, just below thehorizontal accuracy field is the screen backlightindicator. When backlighting is on, a bulb iconwill appear. To turn the screen backlighting onor off:1. Press the B key.2. To adjust the duration of screen backlighting,refer to the operation setup section (page 39).16⌃ReferenceSatelliteStatus Page