Apollo Applications Program Field Test 5 was held March 14-18, 1966, in the Hopi Buttes area, Arizona. The objectives of the test were to 1) evaluate techniques of field checking a moderately complex photogeologic map--techniques potentially useful for lunar geologic exploration; 2) test the feasibility of using a vehicle mounted magnetometer and applying the magnetometer results to real time geologic mapping and interpretation; and 3) evaluate the use of a petrographic microscope as a possible analytical tool for lunar exploration. The test results indicated that for real-time mapping at a station remote from the fieldwork, persons working in the field and at the remote station must be trained as a team, and that the use of a vehicle-mounted magnetometer and a petrographic microscope in lunar exploration should be thoroughly investigated.