310xt vs 910xt – What is different?

	Forerunner 310XT	Forerunner 910XT
High-sensitivity GPS Receiver w/ HotFix^TM	X	X
Water Resistant to 50m	X	X
Open Water Swimming	X	X
Pool Swimming:		X
Distance		X
Stroke Type Identification		X
Swimming Efficiency		X
Stroke Count		X
Lap Count		X
Vibrating Alerts	X	X
Barometric Altimeter		X
HR based Calorie Computation	X	X
Training Effect		X
Multi-sport Mode	X	X
Customizable Screens	X	X
Courses	X	X
Map/Plotter Page	X	X
Waypoint Storage	100	100
Virtual Racer		X
Virtual Partner	X	X
Interval Training	X	X
Auto Lap/Pause/Scroll	X	X
Run/Walk Alerts		X
1 Per Second Recording	X	X
Automatic Wireless Upload	X	X
Fitness Equipment Compatible	X	X
Garmin Connect	X	X
Heart Rate Monitor Compatible	X	X
Foot Pod Compatible	X	X
Speed/Cadence Sensor Compatible	X	X
Bike Profiles	3	5
Power Meter Compatible	X	X
Battery Life	Up to 20 HRS	Up to 20 HRS
Dimensions (HxWxD)	2.1”x 2.2”x 0.8”	2.1”× 2.4”× 0.6”
Weight	2.5 oz	2.5 oz