Grub2 without arrow keys

Grub uses Emacs-like key bindings:

• Ctrl+B = Left, Ctrl+F = Right (mnemonic: backward/forward)
• Ctrl+P = Up, Ctrl+N = Down (mnemonic: up/down)
• Ctrl+A = Home, Ctrl+E = End (mnemonic: A=beginning/end)

See the manual for other key bindings.

You can also define your own key layout and load it with the keymap command. This is not documented in the manual; the Arch Linux wiki has a few pointers.