I disagree with the person above, been married over 30 years, my husband knows how to unlock my phone and I know how to unlock his.  We share our locations because that makes it easier for us to figure out stuff, e.g. where either of us is if we're beginning to think about cooking dinner.  We also both ride motorbikes and so sometimes we'll be bimbling about in the middle of nowhere and not picking up, the tracking means we can have a quick check ...
But it's not 100% accurate, sometimes it doesn't update properly and we'll look like we're miles away from where we actually are.
I mean, ask yourself this, why would your husband share his location with you if he's not going where he says he's going, UNLESS you're actually tracking him without his knowledge?  At the point you're doing that, you've already got serious trust issues in your marriage.  You say something doesn't feel right.  Can you talk to him about your feelings?  I mean what if he's trying to salvage the business?  What if he's depressed and taking himself off?  What if, in a desperate attempt to make some money on the side, he's actually working two jobs?
Logically, I'd say you're dealing with a breakdown in communication.  Sounds like you've both got a lot on your plates.  Also sounds like you want him to know how you feel (alone, confused, anxious, upset) <<< maybe start with that, rather than an accusation which will just get his back up.  Explain that you're feeling vulnerable, you love him, and you're really struggling.  Ask for his help.
EK