5 StreetPilot 7200/7500 Owner’s ManualaPPendixSetting Up the 7500 Software for DRFrom the Menu page, touch Settings > navigation >> Dead reckoning Setup > Settings.odometer Wave type—select Square Wave or SineWave. Determine the proper setting by contacting thevehicle manufacturer or by using an oscilloscope. SquareWave is the most common type.reverse light Polarity—select high or low. Contactthe vehicle manufacturer for polarity or check with avoltmeter. Set to High (most common) if a positive,high voltage is detected when the reverse lights areilluminated. Set to Low if no voltage or low voltage isdetected when the reverse lights are illuminated.Custom POIs (Points of Interest)Your StreetPilot 7200/7500 accepts custom POIdatabases, available from various companies on theInternet. Some custom POI databases contain alertinformation for points such as safety cameras andschool zones. Your StreetPilot can notify you when youapproach one of these points.After downloading your POI database, use the GarminPOI Loader to install the POIs into your unit. The POILoader is available at www.garmin.com/products/sp7500for the 7500 and www.garmin.com/products/sp7200 forthe 7200. Select updates and Downloads. Refer to thePOI Loader Help file for more information; press F1 toopen the Help file.caution: Garmin is not responsible for theconsequences of using a custom POI database orthe accuracy of third-party data.To view your custom POIs, touch Where to? >extras > custom Pois.Deleting Custom POIsTo delete all of the custom POIs, go to the Menu pageand then touch tools > my Data > custom Pois >Delete all.