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Take your ride to the next level with the Edge 205—Garmin's GPS-enabled personal trainer and cycle computer. Perfect for touring and the trails, the lightweight Edge is the ultimate fitness partner. With the easy-to-use Edge 205 on your bike, you always know where you're going and how far you've gone. For advanced cyclists, the Edge 305 is available with either a heart rate monitor or a wireless speed/pedaling cadence sensor to help you achieve your personal best.
The Edge 205 measures speed, distance, time, calories burned, altitude, climb and descent, plus much more. 205 features include:
* Easy-to-install—no calibration required. Just snap it in the included bike mount and go
* High-sensitivity GPS receiver—knows your position even in tree cover and canyons, making it extremely reliable for navigation
* Customizable cycle computer—shows up to eight different data fields for continuous feedback
* Virtual Partner™—lets you "race" a virtual competitor, making training fun
* Courses—lets you "race" against a recorded course to try to match previously set speeds at every point along the way
* Auto Pause™—pauses the training timer when you slow down below a specified speed and resumes when you speed up again so you can focus on your ride
* Auto Lap ™—automatically triggers a lap every time you pass a specified location or travel a preset distance
* Training Center software—gives you the ability to create workouts, manage and download courses, and create a detailed post-ride analysis that charts your performance
With its waterproof, sleek design, the Edge is the perfect companion on any bike, and attaches to either the stem or handlebars. Its rugged case frames an easy-to-read, large, backlit display that can show up to eight different data fields along with altitude and a map view.
Included Training Center software gives you the ability to overlay your ride data onto a course map. It offers interactive analysis tools that measure your speed, distance, climb, and descent against varying terrain, elevation and more. Create and schedule custom workouts or use workout templates and download to the Edge.
Cyclists: get your Edge from Garmin.
Features
Training data: Speed, distance, cadence (305 only), heart rate (305 only), lap by position, elevation, average and max speed, calories burned, climb and descent
History: Automatically records up to 1000 laps. Download to your PC using included Training Center™ software.
AutoPause™: Automatically pauses the training timer when you slow down below a specified speed; timer resumes when you speed up again
AutoLap™: Automatically triggers a lap every time you pass a specified location or travel a preset distance
Courses: Race against a recorded course and previous raced speeds at every point along the way. Combine Courses and Virtual Partner™ features and race an opponent that varies speed while climbing hills and navigating turns.
Virtual Partner™: Race against a virtual competitor. Depicts a digital cyclist (desired speed) in relation to your real-time speed and shows how far ahead or behind you are.
Alerts: Speed, time, distance, heart rate (305 only), cadence (305 only)
Calories: Calculates calories burned based on user profile, performance data and altitude changes
Training Center: PC-based software (included) overlays ride data on a map and graphs speed, pace, heart rate, cadence and elevation. Create and schedule custom workouts or use workout templates and download to the Edge.
Navigation features
Receiver: SiRFStarIII high sensitivity receiver
Mark location: Mark and save up to 100 locations
Find location: Look up and navigate to stored locations
Back to start: Navigate back to starting location
Track log: 13,000 track points
Physical
Size: 1.75"W x 3.7"H x .9"D (44 x 94 x 23 mm)
Display: 1.17"W x 1.44"H (29.65 x 36.69 mm), 128 x 160 pixels, 4-level grayscale LCD with backlighting
Weight: 88 g
Waterproof: Waterproof to IEC 60529 IPX7 standards. All components are submersible in 1m of water for 30 minutes
Battery: 800 mAh rechargeable lithium-ion battery; 12 hours typical use
Antenna: Internal patch
Mount: 2-piece mount with zip ties; mounts on stem or handlebars
PC Interface: USB
Sensors
Heart rate: Robust wireless transmission; sends heart rate data to Edge via chest strap
Speed/cadence: Self-calibrating wireless sensor mounts to bike’s rear chain stay. Wheel magnet mounts to rear wheel for speed; cadence magnet attaches to crank arm.
Edge series comparison guide
Here's how the units are different:
Edge 205:
* Altitude: GPS based
* Elevation profile: yes
* Cadence: no
* Heart rate: no
Edge 305HR:
* Altitude: barometric altimeter
* Elevation profile: yes
* Cadence: yes with purchase of speed/cadence kit
* Heart rate: yes
Edge 305CAD:
* Altitude: barometric altimeter
* Elevation profile: yes
* Cadence: yes
* Heart rate: yes with purchase of heart rate monitor kit
Need more? Further information on this GPS may be directly obtained from 
garmin.com.