bct home


Surveying on Walk 1
Once you are ready and have recorded the conditions, the survey starts with Walk 1.

Remember to hold your detector up at a 45 degree angle and begin walk 1 with your detector tuned to 25 kHz as illustrated in the video clip.

Walk at a steady pace counting any noctule or serotine bat passes only. When you hear a bat, you can take a few moments to stop and identify the species. Immediately after identification continue walking and counting the passes. If you are surveying in pairs one of you could count while the other tries to identify.

If you think a bat pass was by a noctule or a serotine but you are unsure which, note it down as “unsure”. Ignore any activity of other species you might encounter. You can record them on an additional sheet for added interest but do not record them on the survey form. (For definition of a bat pass see the Detector Tips and Skills Section of this tutorial)

When you reach the first spot, stop - this is the end of “Walk 1”. Record the total number of passes on your survey form under “Walk 1”.

(Continue on with the tutorial for more information on identifying noctule and serotine bats).


planning your survey
bat detectors
support surveying walks
surveying at spots
sign up
after your survey
sign up


The Bat Conservation Trust retains intellectual copyright of the material contained in this tutorial.
Any unauthorised use will be considered a breach of that copyright.