Hammer GPS: Long descent explained

I found the answer. 8 inch descent in 23 feet is 2.8986% descent, 1.6603 degrees

Elevation Grade Calculator

Here's an online calculator. You'll need to change the units of Vertical Distance "Rise" to inches and Horizontal Distance "Run" to feet.

 

Thank you for your feedback and for bringing this to our attention. Our team has been actively looking into this issue. While we aim to provide as much detailed information as possible to help with route planning, our top priority is ensuring that the information we provide is accurate and reliable for truck drivers.

Currently, we’re unable to obtain 100% accurate slope grades from our data providers. Because of this, we’ve decided to keep the steep descent warnings in place but will stop displaying specific percentage grades unless we’re absolutely certain the data is correct. We appreciate your understanding and will continue working on improvements to make the app more helpful and precise.