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Speed measurements - speedometer versus GPS


gps-speedmate During some of my paddling workouts in 2003 I used both GPS Etrex Vista and Speedmate to record my speed and distance paddled. I paddled Surfrigger canoe and Spencer X-treme canoe on my local lakes (Horsetooth Reservoir, Boyd Lake and Beaver Pond) under different weather conditions.

The table below summarizes readings from both devices.



time
[hours]		 distance
[miles] 		average speed
[mph]		 max speed
[mph]		 boat
conditions
GPS
SpeedMate		 1:17
1:16		 6.0
5.7 		4.6
4.5 		6.30
- 		X-treme; Beaver Pond; calm
GPS
SpeedMate		 1:03
1:03		 5.3
5.4 		5.0
5.1 		8.8 (?)
7.6 		X-treme; Beaver Pond; calm
GPS
SpeedMate		 2:07
2:22		 10.1
10.2 		4.7
4.3 		6.90
7.60 		Surfrigger; Boyd Lake.; light winds, boat wakes
GPS
SpeedMate		 2:36
2:36		 11.6
12.0 		4.5
4.7 		6.60
7.30 		Surfrigger; Horsetooth Res.; calm, strong headwind during last 3 miles (storm)
GPS
SpeedMate		 2:05
2:04		 10.7
10.8 		5.1
5.2 		6.30
6.90 		Surfrigger; Horsetooth Res.; calm, light winds
GPS
SpeedMate		 2:31
2:30		 12.3
12.6 		4.9
5.1 		6.50
7.10 		Surfrigger; Horsetooth Res.; calm, light winds


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