WhaleNet STOP Data
Harbor Porpoise
Duke University
Marine Lab
"Findley"
Argos Number: 19310, Sex: Male 139cm
Released "Tab" weir at ~18:00 EST 8/22/02
Weir location: 44.733N, 66.733W

Sighting Data
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Harbor porpoises (Phocoena phocoena) tagged and released by researchers with the Duke University Marine Lab.


Tag is a Telonic ST-10 style location only transmiiter with a 6 on 42 off duty cycle (ie data every second day).

Satellite Fixes

Data Format key:
Date (dd.mm.yy): 22.08.98 23:06:55 Time (hr:min:sec)(in GMT), LC (fix quality)

LC just stands for Location Class. Location Classes of 0 and up are the best (derived from 4 or more messages)- a Class 0 is good to within between 1,000 and 5,000 meters. Classes 1,2,3- get consistently more accurate. The letter classes are given no estimate of error, but the A's are better than the B's etc. (Argos Accuracy Table) It appears that some of the letter class locations are pretty good (i.e. several fixes over a short period are quite similar), but then others vary wildly- especially the longitude.

> Lat1: 48.275N [latitude] Lon1: 69.232W [longitude]

"Findley" Data

19310 Date : 23.08.02 02:11:07 LC : 1 IQ : 58 Lat1 : 44.660N Lon1 : 66.687W
19310 Date : 25.08.02 01:25:17 LC : 2 IQ : 68 Lat1 : 44.652N Lon1 : 66.666W
19310 Date : 27.08.02 02:17:03 LC : 1 IQ : 58 Lat1 : 44.744N Lon1 : 66.773W
19310 Date : 29.08.02 01:48:02 LC : 0 IQ : 48 Lat1 : 44.692N Lon1 : 66.668W
19310 Date : 01.09.02 23:50:00 LC : 0 IQ : 58 Lat1 : 44.765N Lon1 : 66.702W

TrackMap "Findley"


Additional and more complete data is available in the WhaleNet listerv.


Analysis Tools

Sample Questions and Activities--

1. How far do harbor porpoise travel a day? (Average)
2. How far did they travel since their initial tagging?
3. Why do you think they are traveling in a particular direction?
4. Why do whales/porpoises migrate?
5. What is the average rate of travel?
6. What other questions do you have regarding "Tab"?
7. How would you find your answers?
8. What other information would you need?


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