Astro Dog Tracking System Owner’s Manual AppendixAccuracyGPS: < 33 ft. (10 m) 95%DGPS: 10–16 ft. (3–5 m) 95% typical(WAAS accuracy in North America)Velocity: 0.164 ft./sec. (0.05 m/sec) steady stateMiscellaneousCompass: Accuracy (when calibrated); ± 2 degrees,resolution; 1 degreeAltimeter: Accuracy (when calibrated): ± 10 ft. (3 m)Resolution: 1 ft. (0.3 m)Range: from -2,000 ft. to 30,000 ft. (from-610 to 9144 m)Interfaces: USB for computer interfaceData Storage Life:Indefinite; no memory batteryrequiredMap Storage: microSD card capacity (a smallportion of the card capacity is usedfor formatting)PowerSource: Astro 220: Two 1.5 volt AA batteries, vehiclepower adapter, USB data cableDC 30: Internal rechargeable lithium-ion battery,vehicle power adapter, AC chargerBattery Life: Astro 220: Up to 24 hours (typicaluse). Alkaline batteries lose capacity as temperaturedecreases. Use lithium batteries when operating inbelow-freezing conditions.DC 30: from 17 to 36 hours. Recharging takes 4½hours.RadioMURS (Multi-use Radio Service) Frequency:151.82 MHz151.88 MHz151.94 MHz154.57 MHz154.60 MHzRange: Up to 7 miles (11.2 km) - line of sight