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Water Switch Option for Turtle Research
Maximize GPS Data and Battery Life and more!
GPS satellites constantly send out signals. Those signals can be received by GPS devices all over the world. But GPS signals do not penetrate water. Therefore GPS data loggers on turtles will fail to record a GPS position if the turtle is under water.
Telemetry Solutions has solved this with our GPS water switch. Not only will the water switch detect water and modify your GPS schedule so that you actually get more GPS positions it will also act independently of the GPS and tell you when the turtle was in and out of water throughout the day. Click below to learn more.
How it works
First you will create and upload a GPS schedule to your data logger. This is the GPS schedule that will be followed assuming the water switch, just prior to every scheduled GPS position attempt, never detects the presence of water .
Second you will set the number of times that a scheduled GPS position should be skipped in the event that, just prior to the scheduled GPS position, water is detected . For example, assume that in step 1 you set the GPS to record a position every hour on the hour. And assume that in step 2 you set skip at 2. Midnight (00:00) is the first time the GPS should turn on. At 00:00 let us assume that the water switch detects water then the 00:00 position will be skipped and the 01:00 will be skipped. But at 02:00 the GPS will turn on regardless of whether or not water is detected.
Third you have the choice to modify the GPS schedule if, just prior to a scheduled GPS position, water is detected. This differs from the skip setting in number 2 above. Here we are instead having the water switch turn on at some new interval to look for water. This is the modified schedule. As soon as water is not detected the GPS data logger will turn on, attempt a GPS position, turn off and then revert back to your original schedule. This feature is not used in conjunction with the skip feature it is used instead of the skip feature. Assume the original GPS schedule as described above, one GPS attempt per hour. Assume that you have enabled the modified schedule setting and set the water switch detection interval to 10 (minutes). Assume that at 00:00, just prior to the GPS data logger turning on, water is detected. Then the GPS will not turn on at 00:00 but the water switch will turn on every 10 minutes thereafter looking for the absence of water. As soon as no water is detected the GPS data logger will attempt a location and then revert back to your original schedule.
Finally you have the last significant water switch setting to either enable or not. This is going to be totally independent of the primary GPS schedule and the water switch effect on that schedule. Here we are using the water switch to detect the presence or absence of water and to record that information in the data set whenever the state changes from water present to water not present or vice versa. We call this the independent water check and the interval at which the check is performed is set in minutes. The independent water check will not affect the primary GPS schedule but it will affect the modified schedule if it detects water before the modified schedule has a chance to do so. Keep in mind that this independent water check will run at the interval that you set throughout every day.