Chris Ralli @rewildman He/Him Eco-entrepreneur. Concerned with the fundamental interconnectedness of all things creative and environmental. Groups Biologging I'm looking for recommendations for a GPS tracking device that would work on turtle doves migration from UK to Sub Saharan Africa and back. Thanks Chris Expand all Collapse all Oldest first Latest first Most popular Rob Appleby @Rob_Appleby | He/him 13 August 2021 9:51pm Hi Rewildman, A couple of questions: Over what sort of time period does the migration occur? And what's the weight limit for a device? And I take it geolocators aren't an option (e.g. https://www.lotek.com/products/mk-geolocators/)? On the commercial front, Lotek also have the 'Pinpoint' range of devices (e.g. https://www.lotek.com/products/pinpoint-gps-store-on-board/). There's also the Ornitrack range from Ornitela: https://www.ornitela.com/ornitrack and small LoRa-enabled devices from Miromico: https://miromico.ch/products/?lang=en If you are after a more DIY approach, check out the article from Kauth et al. (2020 and references therein): https://bioone.org/journals/wildlife-biology/volume-2020/issue-2/wlb.00653/Low-cost-DIY-GPS-trackers-improve-upland-game-bird-monitoring/10.2981/wlb.00653.full which is based on the design from Cain and Cross (2018) https://www.sciencedirect.com/science/article/pii/S2468067217300779 Hope this helps a bit and happy to discuss. Cheers, Rob 1 Reply Chris Ralli 13 August 2021 9:51pm Hi Rob, That's great info. They could have a weight at release anywhere between 110 - 180 grams. Perhaps the heavier birds would be chosen. So I have heard a device that is 5% a birds body weight is the limit. They are captive bred birds. The intention is to hold the birds over the winter and then release this spring 2022 with trackers. There are two scenarios. 1. They may not migrate. If they have been here all winter they may not migrate at all and become a resident population. A tracker that only did a few miles would suffice. To see where they may nest or if they are predated etc. 2. Come the Autumn they will migrate south. This data would be better and show that what we are doing (helping the population increase) is working and birds are either coming back or staying resident. The 5000 km posible migration journey either way could take between 20 to 40 days to complete. The data will tell us which route they take on migration, where they winter and if they rerurn to same breeding grounds. X Reply Matthew Stanton @M_Stanton Zoologist 27 August 2021 1:31pm Hi Rewildman, In addition to Rob's suggestions there is this GPS Tag by Milsar which comes in at 3.5 grams (presumably without a harness). At 5% you should be able to put this on a 70 g bird. https://milsar.com/products/nano-radio-tag-3.html It does not do GSM or LoRa communication though so you would be relying on the dove coming back to your rewilding site. Milsar uses a variable frequency UHF system which is very fast for downloads and rescheduling but really needs to be line of sight (or nearly so). I can't endorse this unit as I have not tried it and each unit costs 1000 EUR and another 1000 for a base station. However, I have been using some larger Milsar units on mammals and they have been working reliably (once I learnt not to schedule them from a virtual windows machine). I would be interested to hear of users experience with this or the miromico unit rob mentioned. Reply X Reply Rob Appleby @Rob_Appleby | He/him 27 August 2021 4:18pm Hi Matthew, hoping to get some results for the wee tags in the next couple of months. Shall definitely report back. Thanks for the Milsar information and glad to hear they are working for you. What's the range of the UHF download BTW? Cheers, Rob 1 Reply Matthew Stanton 27 August 2021 4:18pm I should say I presume it is UHF. Pawel is not particularly forth-coming about how it all works except that it uses a frequency shifting method to retain/optimise reception. With a Yagi antenna (supplied with the base station) I have had good downloads over a km away across a valley). Pawel claims that 5 km is possible but I have not had any line of sight situations that far. You kind of have to guess at the direction although I have had downloads about 300 m away through forest where I later worked out I was pointing the Yagi about 120° off the target. Downloads to the base station go faster than downloading that data to my laptop via USB2. I would love to be able to load the base station under a drone and get my downloads that way but unfortunately my study area is in restricted military airspace :(. If you guys ever get back into the GPS market you should definitely consider adding solar to the units. Would be great for your Dingos. X Reply Kyler Abernathy @KylerA | he/him 24 September 2021 3:12pm Hi Chris, I can say I've had some good experience with the Lotek Pinpoint tags that Rob mentioned. You could also get in touch with ICARUS program at Max Planck (https://www.icarus.mpg.de/en). They've developed a new tracking system, with their own first reciever on the ISS. I think there are some limitations on the availability of their tags now as they're still ramping up their program. Kyler 1 Reply Lars Holst Hansen 24 September 2021 3:12pm The solution with an ICARUS antenna on the ISS is on hold. It is planned that the GRACE-I will be the new satellite system to support the ICARUS: GRACE-I is planned to be launched in 2027.This mentions possible intermittent solutions:I am a bit puzzled there is no mentioning of GRACE-I on ICARUS' own website: X Reply Want to share your own conservation tech experiences and expertise with our growing global community? Login or register to start posting!