I've just been reading through a copy of the Helicopter FE's Debrief Note. No specific mention.
My understanding, as regards rotary wing, is that GPS and other Navaids are No-No for the planned and track crawl legs, but for a practice diversion the candidate should use available aids to assist in refining the initial (MDR) plan. This demonstrates a) working knowledge of equipment in aircraft and b) ability to cockpit manage/division of attention/prioritisation.
Can't see anything wrong with this principle for the 'planks'.