Davis Mark 3 Marine Sextant [011] Winterizing | Heaters/Dehumidifiers This 1" diameter expension mast

This 1" diameter expension mast can be used to increase height of an antenna and thus improve effective range

replaceable and made in the USA

Model Number: 0805007PLB

Shakespeare Style 4187-HD

Davis Mark 3 Marine Sextant [011] Winterizing | Heaters/Dehumidifiers This 1" diameter expension mastMark 3 Marine Sextant Sometimes referred to as a "lifeboat" sextant, the Mark 3 is an inexpensive training sextant. Yet this model has taken sailors around the world, too! It is full sized and has sunshades, but no optical magnification to help you find dim celestial bodies. Comes with instruction booklet. Owner's Manual (pdf)