Brunton Multi-Navigator MNS GPS with Neoprenerying Case 12-channel expedition-quality GPS unit with barometer, altimeter, and digital compass Operates at extreme temperatures and up to 2 weeks on 2 AA batteries Record 10 routes with 1,000 waypoints Barometer displays 24-hour pressure history, 12-hour weather forecast Altimeter records high/low altitudes visited; accurate to 3 feet; includes serial PC interface