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Borrowed from http://www.thinkice.com/glaciology/sv/praktiskisbedomning/sammanvagd/index.htm …
Ice thickness | Ride | Spike effort | Tone and cracks | Behavior |
2 cm, not bearing capacity | Not ride and can not be crossed. | Choose a different path | ||
3 cm, possibly skateable | The ice is often not skateable, but can be crossed by crawling over it or punt forward, legs apart. | Spike is easy through the ice | Very bright tone.Wrapping Crack every meter. | Please choose another route if possible. Cross if you think that the ice becomes thicker later. |
4 cm, skateable | Barely ride. Many signals that the ice is thin. | Drive slowly through to stake your feet apart front. For the accentuation of the signals on thin ice: stop immediately, go back and choose a different path. | ||
5 cm, thin | Akbar. One should keep a low speed to clear any.depletion | Spike makes a hole in the ice and some water comes up. | Go slowly. Tempt the ice often. | |
6 cm, thin | Well ride | Powerful type may be changed.come down to the water | Take the walking pace. Pika now and then. Stomp the ice to listen for the thick security changes. | |
70-10 cm, well-berry | Safe | Several blows are required to get down to the water | Dull tone | Go on at any speed. Look out for visible or audible change. |
>10 cm, väl bärig | Safe | Many blows needed to get down to the water | Very dull tone, barely audible. | Go on at any speed. Look out for visible or audible change. |