Reference41The ‘Poor Satellite Reception’ menu gives youseveral options when an insuffi cient number ofsatellites is received to determine a position fi x.The sun and moon icons on the satellite skyview are forreference (notice that the icons are grayed if the sun/moon is below the horizon). You can see the sunriseand sunset times for your current location and date onthe Time Setup page under System Setup.Not Usable – The receiver is unusable, possibly due to incorrect initialization or abnormal satellite condi-tions. Turn the unit off and back on to reset and re-initialize the receiver if necessary.GPS is Off – The unit is being used indoors and cannot be used for navigation. When the unit is beingused indoors, battery life is saved since the GPS receiver is turned off.Dead Reckoning (2650 only) – The unit isn’t tracking enough satellites for a 2D or 3D fix due to bad sat-ellite geometry or due to a shaded antenna (driving between buildings, etc.) and is using Dead Reckoning.‘Poor Satellite Reception’ MenuIf no satellites are received for several minutes (or an insufficient number of satellites are received todetermine a position fix), a message appears, prompting you to either turn off the GPS for using the unitindoors for practice, update your approximate location (quicker) or have the unit automatically search forthe satellites (takes longer). Updating your approximate location ensures that the StreetPilot 2610/2650 issearching for the correct satellites and is useful if you have traveled over 500 miles with the unit turned off.If the unit has been stored for a few months and the displayed date is incorrect, the StreetPilot 2610/2650does not know the current positions of the GPS satellites.The ‘Poor Satellite Reception’ prompt may appear when you first use your StreetPilot 2610/2650. Theprompt may also appear during normal use if the antenna is shaded or when the unit is used indoors.AccuracyThe GPS Information page indicates the accuracy of the position fix. See Appendix I (pages 56-57) forthe StreetPilot 2610/2650 performance specifications which include accuracy.GPS Info Page