My bluetooth GPS module is years old, bought from eBay real cheap. They seem to have gone out of vogue now, though, only found one on eBay with a quick search:
HOLUX GR-236 SiRF Star III Bluetooth GPS Receiver | eBay
Battery onboard, that can be charged via USB.
This one has an optional external antenna. This is what makes all the difference. Mine runs to the bullbar at the front of the car (can't put on our roof, as there's a roof rack on top that's usually carrying a roof bag) - best spot for reception on ours is the bullbar.
The built-in GPS antenna on a lot of phones and tablets can be pretty good, but having the device inside the car blocks a lot of signal.
All phones I've tried take a while to lock, and struggle to keep a lock or keep accuracy when offroading in the bush (trees!). With the bluetooth with external antenna, I have a full lock by the time I've connected the bluetooth, and have never lost lock in the bush, accuracy never wavers (given away by the consistency of tracks recorded when driving through the bush).



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