Garmin eTrex 221x handheld GPS device for measurement

Multiple Coordinate Systems and Formats

Supports conversion between various coordinate systems and formats such as Beijing 54, Xi'an 80, and CGCS2000

Hardware and Performance

Dimensions 5.4×10.3×3.3 cm

Display Size 2.2 inches

Screen Resolution 240x320

Memory; 8G

Supports Memory Card microSD™ card

Weight (including battery) 141.7 grams

Battery Specification 2 AA batteries

Battery Life 22 hours

Waterproof Rating IPX7

Floating Capability ; Not supported

Reception ; Supported

Interface ; USB

Data Logging

Number of Waypoints 2000

Routes (number × points) 200×250

Track Log (points) 9999

Saved Tracks (number × points) 200×10000

Maps

Preloaded Detailed Maps ; Not supported

Map Support ; Supported

Contour Map Support ; Supported

DEM Elevation Map Support ; Supported

Custom Image Map Support Supported 

Features

Electronic Compass Not supported

Barometric Altimeter ; Not supported

Track Area Calculation ; Supported

Route Area Calculation ; Supported

Position Averaging ; Supported

Beijing 54 Coordinates/Xi'an 80 Coordinates

Wireless Data Transfer ; Not supported

Buzzer Sound Alert ; Supported

Camera Function; Not supported

Image Browser; Supported

Photos; Supported

Position Averaging; Supported

Sun and Moon Astronomy; Supported

Custom POI Support Supported

Tide Table Compatibility ; Supported