This is the 'octopus' (Octans) with σ close to the pole at a right ascension somewhere between 21h and 22h:

The Hindus had the name Dramasa for σ Octantis, according to Allen. No explanation of what the name means.

In my astronomy book are mentioned also α, β, δ, ε, θ, and ν. But there should be 8 stars and the γ triplet close to 0h is conspiciously missing.

Counting with the rest of the Greek lettered stars in the map above I arrive at 21 (not counting more than 1 star for γ and μ). I cannot find η, ο, or ψ. However, in Wikipedia the star list for Octans contains also the 3 absent ones.

My astronomy book says the weak σ was not of much practical use for the southern sailors. Instead they observed stars in the Toucan.

The Magellanic clouds and the Swordfish (Dorado) were also used in their navigation.

... After the neck of Oto Uta had been brought on land, out in the bay of Hanga Rau, the wind, the rain, the waves, and the thunder subsided. Kuihi and Kuaha arrived and told the king the following: 'King Oto Uta is out in the bay of Hanga Rau'. Hotu said to his servant (tuura) Moa Kehu, 'Go down to king Oto Uta and take him up out of the bay of Hanga Rau!' Moa Kehu arose, went down, picked up (the fragment), and carried (it) on his shoulders to the house. There he left it for King Hotu. King Hotu sat down and wept over King Oto Uta. This is Hotu's lament (tanginga):

ka hati toou ngao e oto uta e te ariki e / mo tau papa rangaranga o haho i te tai / mo tuu huehue rangaranga o haho i te tai / mo tau hahave rere ai ka pae / mo tae ngu rere ai ka pae / mo te ika aringa riva nei he aku renga ai ka pae

Broken is your neck, oh Oto Uta, oh king! / Floating (?) like a raft (?) out at sea. / To be erected for the drifting huehue (fish) out at sea. / Able (?) to put an end to the flight of the flying fish hahave; / Able (?) to put and end to the flight of the flying fish ngu; / Put an end to this fish, a dorado, with the good face! (E:87-90) ...

One of his pair of flying fishes (hahave or ngu) could possibly refer to the fish Volans, strangely caught between Argo Navis and the Tree:

γ¹	23h 52m 06.69s	23h52.112m	362.4
γ²	23h 57m 32.99s	23h57.550m	363.8
θ	00h 01m 35.85s	00h01.598m	0.4
γ³	00h 10m 02.27s	00h10.378m	1.8
ο	00h 12m 33.96s	00h12.566m	2.3
ζ	08h 56m 41.88s	08h56.698m	135.3
η	10h 59m 14.16s	10h59.236m	166.4
ι	12h 54m 58.35s	12h54.973m	195.8
κ	13h 40m 56.18s	13h40.936m	207.4
δ	14h 26m 56.74s	14h26.946m	219.1
π¹	15h 01m 50.70s	15h01.845m	227.9
π²	15h 04m 46.96s	15h04.783m	228.7
ω	15h 11m 08.79s	15h11.147m	230.3
ρ	15h 43m 16.10s	15h43.268m	238.5
φ	18h 23m 36.44s	18h23.607m	279.1
χ	18h 54m 47.65s	18h54.794m	287.0
μ²	20h 41m 43.74s	20h41.729m	314.2
μ¹	20h 42m 02.52s	20h42.042m	314.2
σ	21h 08m 46.01s	21h08.767m	321.0
α	21h 14m 43.03s	21h14.717m	322.5
ν	21h 41m 28.47s	21h41.475m	329.3
λ	21h 50m 54.25s	21h50.904m	331.7
Alnair	22h 08m 13.88s	22h08.231m	336.1
ψ	22h 17m 50.70s	22h17.845m	338.5
ε	22h 20m 01.48s	22h20.025m	339.1
υ	22h 31m 37.83s	22h31.631m	342.0
β	22h 46m 03.72s	22h46.062m	345.7
ξ	22h 50m 22.75s	22h50.379m	346.8
τ	23h 28m 03.57s	23h28.060m	356.3

The only star in the Octopus which possibly could have been relevant in line Gb6 up to and including Ko Ruti 6 (285) was φ - i.e., given an uninterrupted reading from Ga1-1: