Garmin GPS 10 Deluxe Garmin Que for Pocket PC Applications Guide   - Page 45

ADDITIONAL INFORMATION > Additional MapSource Data Sets MapSource® Cartography You may want to purchase additional MapSource® map data disks with maps for another country, topographic maps or marine charts. Consult your Garmin Dealer or the Garmin website www.garmin.com for pricing and availability. Additional MapSource map data sets can be purchased from your Garmin Dealer or on-line from Garmin. Consult your Garmin Dealer for a vial able MapSource maps compatible for use with the Garmin Que or visit the Garmin website at (www. garmin.com). world when others under development reach operational status. In addition to satellites in orbit over the Earth, ground based reference stations must also be in place near the region you are located. Enabling WAAS in regions that are not supported by ground stations, which correct position data, typically, does not improve accuracy even when receiving signals from an SBAS satellite. In fact it can degrade the accuracy to less than that provided by GPS satellites alone. For this reason, your Garmin GPS receiver, when in the "WAAS Enabled" mode, uses the method that achieves the best accuracy. To enable/disable WAAS, refer to the General Settings tab of the System Setup Page of Garmin Que. For more information, go to http://gps.faa. gov/Programs/WAAS/waas.htm. MapSource Detailed Mapping Data Disks What is WAAS? The Wide Area Augmentation System (WAAS) is an FAA funded service to improve the overall integrity of the GPS signal for users in North America. WAAS is just one service provider that adheres to the MOPS (Minimum Operational Performance Standard) for global Satellite Based Augmentation Systems (SBAS). Eventually there will be several services of worldwide geostationary communication satellites that broadcast integrity information and differential correction data as transmitted by ground reference stations. At this time WAAS is still in the developmental stage with a goal of providing reliable signals with an accuracy of 7 meters (21-22 feet) both horizontally and vertically 95% of the time. Current tests have shown the actual accuracy to be on the order of 2-3 meters (7-10 feet). This accuracy is comparable to DGPS (as explained below), but without the need for a separate beacon receiver. Since all SBAS systems use the same receiver frequency, any SBAS system should be capable of providing your GPS unit with increased accuracy at any location in the Garmin Que Applications Guide 39