Additional field tools used by observers include a compass, an inclinometer which is often incorporated into some specialized compasses, and an altimeter.
(Additional field tools; used; by observers) (Additional field tools used by observers; include; a compass, an inclinometer which is often incorporated into some specialized compasses, and an altimeter) (an inclinometer; is incorporated; into some specialized compasses; T:often)
Additional field tools Additional field tools used by observers an inclinometer
used include is incorporated
by observers
a compass, an inclinometer which is often incorporated into some specialized compasses, and an altimeter
into some specialized compasses T:often