Several practical and legal issues arise from reading the instrument closely. First, the Direction ties key spatial concepts to external sources. "Fishery" is the area defined in section 3 of the Management Plan, not defined in the Direction, so operators must consult the Management Plan to know the outer limits of the Fishery (s 4(1)). The Heard Island Plateau is described in Schedule 2 with geodesic segments and meridians/parallels; readers must map those descriptors against WGS72 coordinates (s 4(2); Schedule 2). Failure to use the WGS72 datum can cause apparent non-compliance when vessel positioning uses a different geodetic datum.
Second, the Direction’s prohibition on fishing "targeting mackerel icefish outside the part of the Fishery that is the Heard Island Plateau" relies on the concept of "targeting" versus "incidental take" (s 6(1); s 4(1) definition of "incidental take"). The instrument does not define "targeting" in detail. It treats incidental take outside Schedule 2 by immediate quota decrement (note to s 6(1)), but it does not say how authorities will distinguish targeted activity from incidental capture in practice. That distinction could be material in enforcement and quota accounting.
Third, the band prohibition covers fishing "in the part of the Fishery that is between 12 and 13 nautical miles of the baseline" (s 6(2)). The instrumental definition of "baseline" depends on a Proclamation under the Seas and Submerged Lands Act 1973 or on international law baseline rules, and the Direction notes that, as of commencement, no such Proclamation is in force (s 4(1), note). This creates potential ambiguity when identifying the precise 12-13 nm band absent a domestic proclamation. Operators must therefore confirm which baseline is to be used for measuring those nautical miles, and that may require consulting the Seas and Submerged Lands Act context and any relevant international baseline delineation.
Fourth, the instrument repeals two 2014 Directions (Schedule 1). Operators who relied on transitional or residual provisions in those earlier Directions should not assume those provisions remain. The Direction contains no savings clauses, transitional arrangements or express guidance on treating actions taken under the repealed instruments.
Fifth, the instrument is silent on enforcement mechanisms and penalties. It creates prohibitions and an administrative quota consequence for incidental take, but it does not specify investigative powers, appeal rights, or the administrative process by which quota decrements will be imposed or challenged (s 6, note). That leaves uncertainty about procedural protections, timeframes and evidentiary burdens.
Sixth, the instrument does not identify the decision-maker or the person who made the instrument beyond linking it to the Act (s 3). The absence of an explicit authorising official’s name in the text means parties must look to the registration and the public record for the instrument to identify the responsible authority and to check whether any accompanying explanatory materials exist.
Seventh, the instrument remains in force "during the period that this instrument is in force" but does not set a sunset date or periodic review requirement (s 6). The Direction could therefore remain indefinitely until amended or repealed, unless the enabling Act imposes other temporal limits. Holders must monitor for registration of replacement instruments or amendments.
Eighth, the schedule describing the Plateau relies on the Australian‑France Maritime Delimitation Agreement Southern Boundary as a starting point and notes availability in the Australian Treaty Series (s 4(1) note; Schedule 2). Any change in international delimitations, or differences in interpreting that boundary for domestic mapping purposes, could affect the Plateau’s practical mapping.
Finally, the quota consequence for incidental take is unilateral in the Direction; the instrument does not articulate how reporting of incidental catch is to be made, nor the standard for decrementing quota holdings. Operators should not assume that quota decrement will be automatic without administrative process, but they should also not assume that incidental catch will be exempt from quota accounting.