Très curieux ce que tu décris. Je n'ai plus la version basique de Gpsar, donc j'ai analysé avec GpsarPro (à noter que le fichier ne contient pas de données doppler) :
This page was build with GPSAR Pro. Visit www.gpsactionreplay.com
Durée Totale : 03:33:46
Distance Totale : 54,473 Km
Vitesse Moy. Totale : 8,26 Noeuds
Durée au-delà de 10 Noeuds : 01:42:38
Distance au-delà de 10 Noeuds : 44,850 Km
Moyenne au-delà de 10 Noeuds : 14,16 Noeuds
Date : 2009-09-13T10:04:47Z
Location : latitude=51.58942816536585 longitude=3.6299569147301156
Wind direction : 1
Min sats : Off
Max HDoP : Off
Doppler : Off
Integration Method : Rectangular
One per run : On
Alpha Proximity : 50.0 meters
Software Name=GpsarPro Version=4.10
5 best 1 second (at least) average = 49,41km/h [26,68Knots]
1 second run n°1 = 51,51km/h [27,81Knots] (100,2 m. in 7,000 s.) -
1 second run n°2 = 50,69km/h [27,37Knots] (84,5 m. in 6,000 s.) -
1 second run n°3 = 49,01km/h [26,46Knots] (81,7 m. in 6,000 s.) -
1 second run n°4 = 48,18km/h [26,02Knots] (93,7 m. in 7,000 s.) -
1 second run n°5 = 47,66km/h [25,73Knots] (105,9 m. in 8,000 s.) -
5 best 10 second (at least) average = 46,82km/h [25,28Knots]
10 second run n°1 = 48,90km/h [26,41Knots] (135,8 m. in 10,000 s.) -
10 second run n°2 = 47,54km/h [25,67Knots] (132,1 m. in 10,000 s.) -
10 second run n°3 = 46,43km/h [25,07Knots] (193,4 m. in 15,000 s.) -
10 second run n°4 = 45,86km/h [24,76Knots] (152,9 m. in 12,000 s.) -
10 second run n°5 = 45,35km/h [24,48Knots] (138,6 m. in 11,000 s.) -
5 best 3600 second (at least) average = 8,31km/h [4,49Knots]
3600 second run n°1 = 23,28km/h [12,57Knots] (23 277,8 m. in 3 600,000 s.) -
3600 second run n°2 = 18,27km/h [9,86Knots] (18 266,7 m. in 3 600,000 s.) -
5 best 500 meter (at least) average = 39,87km/h [21,53Knots]
500 meter run n°1 = 41,79km/h [22,56Knots] (545,6 m. in 47,000 s.) -
500 meter run n°2 = 41,40km/h [22,36Knots] (517,5 m. in 45,000 s.) -
500 meter run n°3 = 40,93km/h [22,10Knots] (511,7 m. in 45,000 s.) -
500 meter run n°4 = 37,93km/h [20,48Knots] (505,7 m. in 48,000 s.) -
500 meter run n°5 = 37,29km/h [20,14Knots] (507,6 m. in 49,000 s.) -
5 best 1000 meter (at least) average = 34,32km/h [18,53Knots]
1000 meter run n°1 = 35,70km/h [19,27Knots] (1 021,3 m. in 103,000 s.) -
1000 meter run n°2 = 34,73km/h [18,75Knots] (1 051,7 m. in 109,000 s.) -
1000 meter run n°3 = 33,91km/h [18,31Knots] (1 008,0 m. in 107,000 s.) -
1000 meter run n°4 = 33,85km/h [18,28Knots] (1 015,6 m. in 108,000 s.) -
1000 meter run n°5 = 33,39km/h [18,03Knots] (1 038,8 m. in 112,000 s.) -
5 best 10000 meter (at least) average = 14,44km/h [7,79Knots]
10000 meter run n°1 = 25,52km/h [13,78Knots] (10 002,1 m. in 1 411,000 s.) -
10000 meter run n°2 = 25,20km/h [13,61Knots] (10 001,8 m. in 1 429,000 s.) -
10000 meter run n°3 = 21,46km/h [11,59Knots] (10 063,9 m. in 1 688,000 s.) -
5 best Alpha-250 average = 23,90km/h [12,90Knots]
Alpha-250 run n°1 = 24,48km/h [13,22Knots] (224,4 m. in 33,000 s.)
Alpha-250 run n°2 = 24,03km/h [12,97Knots] (213,6 m. in 32,000 s.)
Alpha-250 run n°3 = 23,77km/h [12,83Knots] (244,3 m. in 37,000 s.)
Alpha-250 run n°4 = 23,61km/h [12,75Knots] (190,2 m. in 29,000 s.)
Alpha-250 run n°5 = 23,60km/h [12,74Knots] (242,6 m. in 37,000 s.)
5 best Alpha-500 average = 29,95km/h [16,17Knots]
Alpha-500 run n°1 = 30,67km/h [16,56Knots] (485,6 m. in 57,000 s.)
Alpha-500 run n°2 = 30,40km/h [16,42Knots] (498,3 m. in 59,000 s.)
Alpha-500 run n°3 = 30,11km/h [16,26Knots] (476,7 m. in 57,000 s.)
Alpha-500 run n°4 = 29,70km/h [16,04Knots] (495,0 m. in 60,000 s.)
Alpha-500 run n°5 = 28,88km/h [15,59Knots] (393,1 m. in 49,000 s.)
5 best Alpha-1000 average = 30,59km/h [16,52Knots]
Alpha-1000 run n°1 = 33,11km/h [17,88Knots] (975,0 m. in 106,000 s.)
Alpha-1000 run n°2 = 32,21km/h [17,39Knots] (993,2 m. in 111,000 s.)
Alpha-1000 run n°3 = 30,61km/h [16,53Knots] (935,2 m. in 110,000 s.)
Alpha-1000 run n°4 = 28,61km/h [15,45Knots] (930,0 m. in 117,000 s.)
Alpha-1000 run n°5 = 28,41km/h [15,34Knots] (986,3 m. in 125,000 s.)
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) est aléatoire et plutôt lent (de 3 à 10 S) donc pour le coup, ses Vmax 2S / 5S / 10S voire 100m sont souvent identiques !
, on imagine que des accélérations/décélérations, il doit y en avoir en 10secondes ...
le lascard 
(il progresse vite l'animal)
