(section: 2 / paragraph: b / line: 3)
Any compass that allows to take strike, dip, plunge, and trend measurements will be good. Therefore, students need a compass that, on top of indicating the magnetic North, also has a clinometer and allows sighting distant landmarks.
(section: 4 / paragraph: e / line: 1)
All Silva compasses in the "Ranger" series provide a cheaper and good alternative to the much more expensive Brunton compass.