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Thanks for responding Renzo.
I will try to explain more precisely what I need to do.
Basically it is a bird gps tracker with the lowest possible weight, size and cost.I see two possible options regarding the type of tracker:
1- A tracker that transmits the data via GSM but also has the option of transmitting it via VHF to a receiver (I would also have to manufacture the receiver). Basically being able to manufacture these devices: https://milsar.com/products/gsm-radio-tag-m9.html
That would be necessary because in many of the study areas there is no GSM coverage.2- A tracker that transmits the data via satellite connection using something like: https://www.globalstar.com/en-gb/products/embedded-solutions/st100 for example.
That would be ideal since you can transmit Gps data anywhere in the world without depending on there being GSM coverage or a VHF receiver.For both options I would need them to have a solar panel to charge and maintain the battery for as long as possible.
I know it is not an easy thing to do but I also know that it is not impossible if you have the will.
For the GPS module how about this one: https://es.aliexpress.com/item/33034354199.html?spm=a2g0o.detail.1000014.8.bad93419dPmhhf&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.148453.0&scm_id=1007.13338.148453.0&scm-url=1007.13338.148453.0&pvid=ee05edda-12b6-4d54-b32f-ea3c5e3f659b&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.13338.148453.0,pvid:ee05edda-12b6-4d54-b32f-ea3c5e3f659b,tpp_buckets:668%230%23131923%2358_668%23808%237756%23233_668%23888%233325%237_3338%230%23148453%230_3338%233142%239890%2310_668%232846%238115%23872_668%232717%237563%23522_
It is really small, weighs only 1.6 grms.
That one already have the two things, GPS and GSM. I don’t know how much is his weigh
