He is a good map-reader.    From Wordnet, Princeton University. 

To make one false turn, or to turn without noticing the fact, by night threw the best map-reader or scout off his path and bewildered his calculations.    From Wordnik.com.  [The Story of the 2/4th Oxfordshire and Buckinghamshire Light Infantry] Reference

My admiration is unbounded for any woman so prepared to acknowledge that she makes a naturally crappy map-reader / navigator that she is willing to be scared for life in the greater cause of not sending me down the wrong road.    From Wordnik.com.  ["It held me like two angels' hands."] Reference

Eight out of ten (79 per cent) admit to having regular conversations with their electronic map-reader and almost a third of drivers (32 per cent) have got into an argument because of their devices.    From Wordnik.com.  [Entertainment - Female First] Reference