20SECTION1To change the DOP/EPE field:1. Press N and rotate O to display the satellite status page.2. If the desired field (EPE or DOP) is not displayed, press C.3. Use K to change between ‘epe’ and ‘dop’. Press C to finish.The receiver status field, located on the second line (left side) of the page, willdisplay the following messages under the appropriate conditions:Search Sky - The GPS 155XL is searching the sky for visible satellites. Youwill be informed with the message ‘Searching the Sky’.Acquiring - The GPS 155XL is acquiring satellites for navigation.2D Nav - The GPS 155XL is in 2D navigation mode. If your installationdoes not include an altitude serializer, you must enter the alti-tude manually (see page 2). ‘2D Dif Nav’ will appear when youare receiving DGPS corrections in 2D mode.3D Nav - The GPS 155XL is in 3D navigation mode and will computealtitude. ‘3D Dif Nav’ will appear when you are receiving DGPScorrections in 3D mode.Simulator - The GPS 155XL is in simulator mode, which should only beused for practice and trip planning. Never use simulator modefor actual navigation.Poor Cvrge - The GPS 155XL cannot acquire sufficient satellites for navigation.Need Alt - The GPS 155XL needs altitude in order to start/continue naviga-tion. Press N to display the position page and enter altitude.Not Usable - The GPS 155XL is unusable due to incorrect initialization orabnormal satellite conditions. Turn the unit off and on again.AutoLocate - The GPS 155XL is looking for any satellite whose almanac hasbeen collected. This process can take up to five minutes.‘Searching the Sky’ for satellites. No satellitealmanac data exists in the GPS 155XL. It mustbe recollected from the first available satellite.‘Acquiring’ satellites for navigation. In this case,the satellites are being received, but the data isstill being collected before a position can bedetermined.NAV KEYReceiverStatus Field