So I'm in the market for a Kestrel but obviously, I'm not a pro shooter (I'm actually an older guy but brand new to wanting to shoot groups at longer range). I'm going to buy a Kestrel (This weekend) but I don't know if I need the "elite" model. Can I get by for now with just a regular 5700 Ballistics meter? If I wanted to upgrade later, could it be as simple as a download package from Kestrel or would I have to purchase a whole new unit?