Aidless

1637, John Milton, Comus, London: Humphrey Robinson, p. 20, I found the place Where that dam’d wisard hid in slie-disguise (For so by certain signs I knew) had met Alreadie, ere my best speed could praevent The aidlesse innocent Ladie his wish’t prey,

It is not meet, Sir King, to leave thee thus, / Aidless, alone, and smitten through the helm.

Aidless navigation has the advantage of not requiring equipment, but is much less accurate.