does this compass have adjustment for declination?

It does not have PRESET declination - the mechanism in some compasses allowing you to preset the compass for local declination so that the compass always gives bearings as they relate to true north. Instead, each time you take a magnetic bearing on this compass, you must adjust the compass dial, manually adding or subtracting the local declination to get a true north bearing. Vice versa when you take a true bearing from the map and convert it to a magnetic compass bearing.

Does this have to be near horizontal for the arrow to float freely, or can it be tilted up, say 45 degrees and work?

NO handheld compass can be tilted at 45 degrees to the horizontal and still give accurate readings. Like any compass that rests on a central pivot, you have to hold the compass horizontal to just a few degrees or frictional contact will give erroneous readings - or even stick the dial against the bottom of the compass well. It's not hard to do.

Would this still work if you left it on the dashboard of your vehicle?

As noted by others this is a *magnetic* compass so it aligns it's own magnetic field with the net magnetic field wherever it is located. Any Iron or steel (excluding certain types of stainless steel) will warp the nearby magnetic fields (both the earth's field and the field emitted by the compass needle will be affected). Devices like this are designed to be used in the woods by a boy scout who is not wearing an iron belt buckle. The suitability of any other electromagnetic environment needs to be confirmed if you want reliable readings. Devices placed in cars have to be designed and placed carefully because cars have lots of steel. Below you will find a hilarious photo of a compass next to a phone and the magnetic needle is pointing at the phone instead of north (which has lots of electric fields and possibly magnetic materials, I just tested with my pone and it definitely deflects the needle when the phone is close) The guy posting the photo clearly has no idea that the photo proves his ignorance rather than the malfunction of the compass. Sadly he's given the product a poor rating it doesn't deserve.

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🧭 Master the wild with pinpoint precision and style!

MAP READY ACCURACY - Calibrated to 1:25000 scale, perfect for detailed topographic navigation.
NAVIGATE LIKE A PRO - Liquid dampened needle ensures flawless, jitter-free readings every time.
READY OUT OF THE BOX - Includes clear instructions and a durable lanyard for on-the-go convenience.
COMPACT LIGHTWEIGHT - At just 2.54 cm and 50g, it fits effortlessly in your hiking kit without weighing you down.
PRECISION AT YOUR FINGERTIPS - Transparent base with dual scales (inches & mm) for exact map measurements.

The Deluxe Map Compass by Coghlan's is a compact, liquid dampened compass featuring a see-through base with inch and millimeter scales, calibrated to a 1:25000 map scale. Lightweight and portable at 50g, it comes complete with instructions and a lanyard, making it an essential tool for professional-grade outdoor navigation.

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