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Almost all modern mobile phones have built-in GPS. You do NOT need mobile coverage or Internet to use GPS. It might be not precisely accurate, but that's not a problem as you are not driving in a city and a GPS error of 20 meters is absolutely irrelevant.
All GoTo with WiFi would work perfectly without any mobile coverage or Internet. You only need to pre-install application once and that's it. After that mobile phone would connect directly to GoTo mount and use GPS coordinates from the phone.
For the first telescope I strongly recommend a GoTo one on Alt-Az mount. Something like Skywatcher 127 Mak Mini AZGTe GoTo WiFi. It's certainly within the budget and have all features you need. Or Celestron NexStar 5SE - it's a bit off your budget, but a great tool. Do not buy manual mounts unless you know exactly what you are doing. Full stop.
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