My partner is exactly this. It was a bit of a struggle for me to understand at first as I'm the complete opposite, if I go somewhere a couple of times, even to other countries, I can get back there again, and I'm pretty good at remembering time estimates between places. In my old job we had 120 locations to deliver to, and I never used a sat nav, never got lost. My memory is awful in other regards though, likes peoples names, or things people tell me.
I've indulged in that bit of innocent bragging just to highlight the contrast with my partner, who I thought at times when I met her was pulling my leg. She can get lost in a tescos, certainly coming out of one. If the exit is to the left of the checkouts, she will instinctively want to go right (assuming she cant see the exit from where we are). She's terrible at remembering landmarks.
We can do the same journey, say to my Mums house, a week apart, and I will be the passenger acting as the sat nav, and very little from the 20 minute journey stays in her mind, so we'll get to the same, very recognisable roundabout from the week before, and she will ask left or right?
It's become one of those little quirks that I truly love about her.