Seeking is done using the s command. It accepts a math expression as argument which can be composed of shift operations, basic math operations or memory access operations.
[0x00000000]> s?
Usage: s[+-] [addr]
s print current address
s 0x320 seek to this address
s- undo seek
s+ redo seek
s* list undo seek history
s++ seek blocksize bytes forward
s-- seek blocksize bytes backward
s+ 512 seek 512 bytes forward
s- 512 seek 512 bytes backward
sg/sG seek begin (sg) or end (sG) of section or file
s.hexoff Seek honoring a base from core->offset
sa [[+-]a] [asz] seek asz (or bsize) aligned to addr
sn/sp seek next/prev scr.nkey
s/ DATA search for next occurrence of 'DATA'
s/x 9091 search for next occurrence of \x90\x91
sb seek aligned to bb start
so [num] seek to N next opcode(s)
sf seek to next function (f->addr+f->size)
sC str seek to comment matching given string
sr pc seek to register
> 3s++ ; 3 times block-seeking
> s 10+0x80 ; seek at 0x80+10
If you want to inspect the result of a math expression you can evaluate it using the ? command. Simply pass the expression as an argument. The result can be displayed in hexadecimal, decimal, octal or binary.
> ? 0x100+200
0x1C8 ; 456d ; 710o ; 1100 1000
In visual mode you can press u (undo) or U (redo) inside the seek history.