Other modifications Over the years several adjustments have been formulated in an attempt to make the rule more accurate . The simplest correction is to add 25 or 50\% to the time predicted using Naismith's rule. While this may be more accurate for some people or under certain conditions, it does not explicitly account for any additional variables . The accuracy of some corrections is disputed by some , in particular the speed at which walkers descend a gentle grade. Other common corrections are: When walking on uneven or unstable terrain, allow 1 hour for every forward, instead of 1 hour per . On a gentle decline (about 5–12°), subtract 10 minutes per 1000 feet of descent. On a steep decline (over 12°), add 10 minutes per 1000 feet of descent. Tranter's corrections
Other modifications Over the years several adjustments have been formulated in an attempt to make the rule more accurate by accounting for further variables such as load carried, roughness of terrain, descents and fitness (or lack of it) . The accuracy of some corrections is disputed , in particular the speed at which walkers descend a gentle gradient. No simple formula can encompass the full diversity of mountain conditions and individual abilities. Tranter's corrections
R
. The simplest correction is to add 25 or 50\% to the time predicted using Naismith's rule. While this may be more accurate for some people or under certain conditions, it does not explicitly account for any additional variables
by accounting for further variables such as load carried, roughness of terrain, descents and fitness (or lack of it)
D
by some
R
grade. Other common corrections are: When walking on uneven or unstable terrain, allow 1 hour for every forward, instead of 1 hour per . On a gentle decline (about 5–12°), subtract 10 minutes per 1000 feet of descent. On a steep decline (over 12°), add 10 minutes per 1000 feet of descent.
gradient. No simple formula can encompass the full diversity of mountain conditions and individual abilities.