Does the Bushnell BackTrack Mini GPS have any issues with magnetic interference

Additionally, interference from structures can affect the GPS signal, which is critical for accurate location tracking. This means that while the device may work well in open areas, it could struggle in environments with significant obstructions or magnetic fields[2][4].

Overall, while the BackTrack Mini GPS is designed for ease of use and portability, its performance can be hindered by both magnetic interference and environmental factors, making it essential for users to be aware of these limitations when using the device in various settings.

Citations:
[1] https://www.trailspace.com/gear/bushnell/backtrack/
[2] https://www.amazon.com/Bushnell-GPS-BackTrack-Personal-Locator/dp/B001F7BL0U
[3] https://www.amazon.com/Bushnell-BackTrack-Personal-Locator-Orange/product-reviews/B001F7BKZQ
[4] https://www.bushnell.com/bu-product-faq-gps.html
[5] https://www.bushnell.com/on/demandware.static/-/Library-Sites-HuntShootAccessoriesSharedLibrary/default/dw8db14c1e/productPdfFiles/BackTrackGPSMini_1L_Manual_0422.pdf
[6] https://forums.geocaching.com/GC/index.php
[7] https://www.bushnell.com/on/demandware.static/-/Library-Sites-HuntShootAccessoriesSharedLibrary/default/dwae7e299a/productPdfFiles/BackTrackGPSMini_Manual_7LM_0422.pdf

Are there any known issues with the Bushnell BackTrack Mini GPS and digital compass calibration

Yes, the Bushnell BackTrack Mini GPS has some known issues related to digital compass calibration:

Magnetic Interference

The digital compass can be affected by magnetic interference, causing inaccurate readings. Users have reported that holding the device near magnets or metal structures can throw off the compass[1][4][8].

Frequent Recalibration Needed

It's recommended to calibrate the compass before each use, especially after moving the device a long distance like in a car or plane[1]. The compass may need recalibration if readings are off by 180 degrees or more[4].

Proper Orientation During Use

To ensure accurate compass readings, the BackTrack Mini should be held level, not tilted, with the display facing up in the palm of your hand[1]. If you hold it like a compass, then drop your hand down to walk, then bring it back up level, the readings may not be accurate[4].

Calibration Procedure

To recalibrate the compass, hold the BackTrack Mini level and move it in a horizontal "figure 8" pattern a few times until the "Calibration Complete" message appears[1][2]. This allows the device to sense the Earth's magnetic field and correct any interference.

So in summary, the BackTrack Mini's digital compass is susceptible to magnetic interference and may require frequent calibration, especially if the device is moved a long distance or held in the wrong orientation. Performing the figure 8 calibration procedure while holding it level is the best way to ensure an accurate compass heading.