Altimeter
This small metal device resembles an oversized pocket watch.  It has a dial indicating altitude in feet.  Because it relies on atmospheric pressure, local weather can greatly affect its accuracy, often making them inaccurate to hundreds or even thousands of feet.  Altimeters are often built specific to a world, although expensive altimeters built for multiple worlds are sometimes manufactured.  Altimeters usually have areas of the dial that indicate danger due to low air pressure (suffocation risk), or, sometimes, heat danger at low altitude.

Due to its cost, many airships on Thresher go without one, relying instead on altitude estimation by the crew.

Cost: 1,000 GP, Weight: 1 lb
This message was last edited by the GM at 19:55, Fri 11 Dec 2020.

Astrolabe
This metal disk has several smaller disks on it that freely rotate. It is used for determining the angle to various celestial objects.  Combined with the current time of day, this can be used to determine one's latitude on a world with a DC 15 Survival check (or other appropriate skill check).

Cost: 100 GP, Weight: -
This message was last edited by the GM at 06:31, Sun 13 Dec 2020.