I'm trying to figure out possible methods in sending GPS location in my project to the server and one possible option is still mystery to me. I hope someone will be able to clarify it.
The most common option as I understand is to have something like this GPS module and send gathered information via GSM module connected to this.
However, I see many travelers on Facebook use something like SPOT devices. According to the website they can send position back to user without GSM connection. So how this can be done? Are there some other GPS modules beside the ones like on Adafruit? I've checked different websites and cannot find any with transmitting capabilities. The one idea I have is suggested by one of their products - satellite phone. Maybe they just use instead of GSM signal satellite signal (I have no idea what's the name of that).