Some cranes come with complete load charts loaded into their on-board computers, but there are still full paper-book charts available in every crane cab.
A critical part of operating any crane is correct interpretation of load charts. Load chart includes a lot of information, but in general it is used to determine what weight the crane can lift and at what radius in given configuration. Load chart variables are: type and weight of hook block, type and length of boom and boom extension (fly), number of reevings, applicable counterweight(s), applicable deductions, outriggers base, wind speed restrictions etc. The operator must be very careful in reading the load chart as any mistakes might end in a potential disaster.