Garmin 010-02258-10 GPSMAP 64sx, Handheld GPS with Altimeter and Compass, Preloaded with TopoActive Maps, Black/Tan

Garmin GPSMAP 64sx is a dedicated backcountry navigation GPS that combines a high-sensitivity multi-GNSS receiver, barometric altimeter, 3-axis electronic compass, and preloaded TopoActive maps in a rugged handheld form factor designed for extended field use. The 64sx targets serious backcountry hunters, hikers, and expedition users who need the navigation reliability of dedicated GPS hardware rather than phone-dependent apps — with 16-hour battery life on 2 AA batteries and a weatherproof body built for the conditions where navigation precision matters most.

Barometric Altimeter vs. GPS-Derived Altitude

GPS altitude calculations are less accurate than horizontal GPS positioning — typical vertical accuracy is 3x worse than horizontal. A barometric altimeter provides continuous, highly accurate altitude measurement by correlating atmospheric pressure to elevation, updated faster than GPS satellite recalculation. For hunters navigating technical mountain terrain where knowing your elevation relative to a ridge or basin is critical for navigation and game locating, the barometric altimeter provides meaningfully more reliable elevation data than GPS satellites alone.

• Multi-GNSS receiver — GPS + GLONASS for accuracy under canopy and in canyons
• Barometric altimeter — precise elevation measurement for mountain terrain
• 3-axis compass — works regardless of device orientation
• TopoActive maps preloaded — navigate from day one without additional purchase
• 16-hour AA battery life — extended use on commodity batteries anywhere

64sx vs. GPSMAP 66i for Backcountry Hunting

The 64sx provides superior navigation hardware at a lower cost without satellite communication. The 66i adds inReach two-way messaging and SOS capability with a subscription requirement. For hunters in areas with cellular coverage who want emergency communication via cell phone, the 64sx provides full navigation capability without the subscription cost. For truly remote backcountry hunting where cellular coverage is nonexistent, the 66i's communication capability is worth the premium and ongoing subscription cost.