Abstract
We evaluated the success rate and accuracy of GPS collar telemetry on a free ranging Japanese monkey (Macaca fuscata). Total success rate was 39.7%, and higher in daytime than nighttime. At nighttime, the monkey was resting in the forest. The weakness of GPS signals and deterioration of ephemeris data in the forest environment may have led to the low success rate. The 50th-95th percentile errors of the GPS at 3D fix status was 11.8m to 39.9m and at 2D fix status (DOP<6) was 15.7 to 53.1m, respectivly. The accuracy of the GPS on a free-ranging animal was almost the same as at a fixed position.
