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Articles

What is barometric pressure? How is it affected by weather and altitude?

Barometric pressure is air or atmospheric pressure as measured by a barometer. Because gases in the earth’s atmosphere have m

What are magnetic declination and inclination?

The magnetic poles of the earth aren’t at the same locations as the geographic poles. For example, the magnetic north pole is located in the Arctic Ocean north of Canada at

Why is the sea level pressure important for my TrekGuide’s altitude measurements?

The TrekGuide’s altitude is based on air pressure measurements made with the unit’s barometer. A barometer measures barometric (air) pressure, which is affected by altitude, the air temperature, humidly and weather

Do I need to set the TrekGuide’s maximum altitude? What does it mean?

Maximum altitude is the measurement of the highest altitude place you have visited with the TrekGuide. The unit will keep this reading until the batteries are removed.If you don&

How do I change time settings – temperature – air pressure – altitude units on the TrekGuide?

Press and hold the Mode key (the one with the T above it) for 3 seconds to enter settings mode.Then use the “▼/B”or “▲/A” keys to change to the settin

My TrekGuide is switching all by itself from the barometer mode to the altimeter mode. What is wrong?

Nothing is wrong. The TrekGuide will automatically switch from the barometer mode to the altimeter mode in two circumstances: 1) when moved from a resting position; 2) when movin

What do I need to know about my TrekGuide and battery use?

The TrekGuide uses two lithium-type CR 2032 batteries. These are widely available at hardware stores, drug stores, etc.The TrekGuide does not have a power off switch.

How accurate is the altitude given by the TrekGuide?

The accuracy is 10 to 30 feet (3 to 10 meters) at lower altitudes up to 1500 feet (500m).For best results, it should be corrected as described here: