What do we mean by "spatial literacy" in a GIS context?

PCT No. PCT/JP88/00914 Sec. 371 Date Mar. 13, 1989 Sec. 102(e) Date Mar. 13, 1989 PCT Filed Sep. 9, 1988 PCT Pub. No. WO89/02386 PCT Pub. Date Mar. 23, 1989.A power steering apparatus includes a motor 5 connected through a clutch 6 and a worm gear mechanism 50,51 with a steering column 12. A multi-lead strap 46 is wound around the steering column within a first cylindrical housing 23 for electrically connecting a torque sensor 4 to terminals disposed outside the steering column. The worm gear mechanism includes a worm wheel 50 fitted on the steering column in the first housing, and a worm shaft 51 in mesh with the worm wheel and disposed in a second cylindrical housing 54 adjacent the first housing. The second housing has one end closed and the other end open. The worm shaft is rotatably supported at one end by a first bearing 52 press fitted in the closed end of the second housing and at its other end, which is connected with the clutch, by a second bearing 53 fixedly mounted thereon, such that the worm shaft can be axially removed from the second housing through its open end.