  We have performed high resolution angle-resolved photoemission measurements
on superconducting electron-doped NaFe$_{0.95}$Co$_{0.05}$As ($T_{c}\sim$18 K).
We observed a hole-like Fermi surface around the zone center and two
electron-like Fermi surfaces around the M point which can be connected by the
$Q=(\pi, \pi)$ wavevector, suggesting that scattering over the near-nested
Fermi surfaces is important to the superconductivity of this "111" pnicitide.
Nearly isotropic superconducting gaps with sharp coherent peaks are observed
below $T_c$ on all three Fermi surfaces. Upon increasing temperature through
$T_c$, the gap size shows little change while the coherence vanishes. Large
ratios of $2\Delta/k_{B}T_{c}\sim8$ are observed for all the bands, indicating
a strong coupling in this system. These results are not expected from a
classical phonon-mediated pairing mechanism.
