Her is the difference. If there is any more to add, let me know.
| Indoor Gym | Outdoor Crag | |
| Grading credibility | trustworthy | 5.9 could be 5.10c |
| order of grade | meant to be honest | hard to know if 5.8 is truly 5.8 easy one can be difficult to someone, vise versus. |
| who puts grade? | Professional | anybody can FA |
| Bolt distance | Every 1 m | 5 bolts for 15ｍ, sometimes 1 bolts in 50ｍ |
| Bolt strengh | 25Ｋｎ | depends on many thing, how old, bolt type, who puts it....? |
| Bolt maintenance | done by gym | 40 years outside in rain and shine, perhaps snow, never able to tell |
| Who's responsible? | The gym | You |
| fallen object | never | norm. any small animal can make fallen rock |
| Holds are... | attached firmly so it won't come apart | come apart by nature |
| shape of the wall | a lot of times overhang | slab, face, overhang, wide, crack so many |
| your belongings | stay in a rocker in the gym | should stay where there is no fallen rock |
| belay | let it fall | minimum slack & soft catch |
| air | conditioned | too heated or too cold |
| sun | is not the problem | is a big problem |
| bugs | none | a lot |
| weather | is not the problem | is a big problem |
| route finding | follow the rad ones | you find it by yourself |
１）Never fall before you take 3 pins
２）Don't pull off a climber from a wall
３）practice how to use the belay station and anchors before you go to a crag
４）Belay is within 1m from the wall, never too far
５）Don't speak while you are belaying, the distraction means you are not attentive.
６）Belay with thinking of what will happen if a climber fall now all the time...
７）Do your homework with bolting in that specific crag
８）Do not trust old piton and bolts in the mountain
９）Prepare for failure and accidents, before going.
１０）5.9 could be 5.10c, be prepared.
１１）Sport route(=bolt route) can be runnout, without saying R.
１２）Who made the problem? Do your research. or develop your eyes for it.
１３）Crag made after 2000 are relatively safe.
１４）2 grade below should be climbed in multi-pitches. naver fall. can be fatal.
１５）Check wire.
１６) Rappel and prusik is a must.
１７）Be picky on your belayer.