摘要：When estimating fish position via radiotelemetry, the final deviation of a recorded fish location from its actual location (total error) is influenced by two separate types of error—locating error and mapping error. Although locating error is increasingly addressed in radiotelemetry studies, quantification of total error is much less common. We describe an anchor design useful for positioning test transmitters in a riverine environment where high discharge is capable of repositioning test transmitters. Further, we quantify and contrast total error when test transmitters are located by homing and their position recorded using two types of global positioning system (GPS) receivers. Directional error was not uniform; instead, it was biased in a northerly direction. We attribute this northerly bias to inaccuracy when mapping the original placement of transmitters. Median distance error was approximately 4 m. No significant difference in distance error between test transmitters or GPS receiver type was observed, and distance error was independent of time. We conclude that the anchored transmitters remained stationary throughout the study.
