Oh, sorry for misunderstanding.Andy wrote: ↑October 6th, 2020, 1:43 pmI understand the problem of not having GPS data inside your house, and I understand the use case of needing a GPS receiver sitting by the window, that can relay GPS data to your phone. My question was more about, what is the use case of having some Unleasheds using data from the phone and others using GPS data from a receiver? You said that those GPS receivers wouldn't have data inside anyway.
And why would you want this?[...] that some Unleasheds use the internal smartphone GPS data and other Unleasheds use the external rerouted GPS data.
Sometimes you walk in a forest (well, I do sometimes) and the external GPS device losses its GPS satellite fix (due to the trees). Now you can have a problem if you configured the Unleashed to only use the external GPS device as its source (as an accessory). So, better is to have both smartphone and external GPS as source. But, sometimes the opposite is true as well: the external GPS does have a fix, but the smartphone has no fix (no cellphone network in the forest). Still no problem you think, right? But what if there is a certain gap between the two receivers, either the one or the other having a fix for a period of time, not logging the data inside the device? Is it still enough for post-editing the geotag data inside the photo's? The external GPS device does not log GPS data if it has no fix, so "so far for the logging". Logging of the external GPS device is useless if it doesn't contain the logging of the gap-period and you have no backup (smartphone logging).
Concerning the use of the smartphone as the GPS source VERSUS the use of the external GPS receiver as the GPS source:
Simple, sometimes I walk with other people at a location in which the other people do not have a camera themselves (or a smartphone! yes, such people DO exist ;)), so they use one of my camera's. That means one camera moves away from my location (even beyond the 40m distance of the Bluetooth Low Energy range) and thus needs to have the external GPS receiver alongside with it. Otherwise, not geotagging inside the photo's.
Sometimes I let one camera do a timelapse on a fixed location (attic for example) and have that camera/Unleashed paired with the external GPS receiver, while I use other camera(s) for other purposes, thus these camera's are hooked up to my smartphone alone (both of them). Leaving the camera at the attic unattended with the external GPS device next to it.
In the old days (Unleashed'09) each Unleashed had an dedicated external GPS receiver, so this was no 'problem'. But nowadays, this is no longer mandatory due to the smartphones and newer external GPS receivers. Problem is only that when camera's separate each way, outside the Bluetooth range, you have to have a dedicated GPS source. But I don't have 3 separate BT Low Energy GPS receivers nowadays. So what I could do is use an old BT Classic GPS receiver and let it forward its data over the smartphone to two camera's/Unleasheds I am carying along the way into the forest, thus making sure I have best of both worlds: one single external GPS receiver broadcasted over two Unleasheds, through the smartphone and one smartphone as a fallback/backup when the external GPS receiver losses its satellite fix. Then I need to have the Unleasheed App to become a broadcaster of a GPS Provider, thus the GPS Providers should be configured loosly coupled to the smartphone and Unleashed App, meaning: don't pinning the GPS device (either smartphone or external device) to a specific Unleashed, but making it more wider used as in the Publish-Subscribe mechanism. Then you have a "market full of GPS providers" to which anyone can subscribe and unsubscribe (as long as they are in range of the publisher of course.
I hope this answers your question. You are really sharp in questioning today ;-)
Note: this 'problem' was not possible back in the days of the Unleashed'09, but that was because each Unleashed had its own decicated external GPS receiver and there were no smartphones commonly used as remote control and GPS provider. A lot has changed since BT Low Energy became mature enough for better solutions.