An iKeGPS spokesman declined to comment on the listing speculation.
Milnes told the Business Herald last month that the company was looking at "a whole range of growth financing options", but he wouldn't rule out an NZX-listing.
He said the company was looking to raise up to $40 million in expansion capital.
IkeGPS raised more than US$200,000 through crowdfunding website Kickstarter, which it used to fund Spike's development.
The company won a lucrative licensing deal with GE Digital Energy, a subsidiary of US conglomerate General Electric, which is marketing the measurement device under the GE brand.
"IkeGPS is in the transition from being development and partner focused to aggressively expanding and growing the business by building out the sales and marketing of GE MapSight and Spike around the world with the backing of globally recognised partners such as General Electric," Milnes said.
Christie also chairs NeSI, which provides high performance computers and support systems to New Zealand researchers, and the Science Media Centre.
He joins Bruce Harker, the current chairman of TrustPower, and Peter Britnell, the founder of GE Small World, as ikeGPS's third independent director.
IkeGPS was founded in 2003 by Leon Toorenburg, who got the idea for the technology while maintaining communications networks in Kenya.
Its shareholders include Jenny Morel's No8 Ventures, the government-backed New Zealand Venture Investment Fund and General Electric.
New Zealand Software firms Serko and Gentrack are gearing up to list on June 24 and 25, respectively.
The success of online accounting software developer Xero has encouraged many privately owned technology firms to look at listing.
Other technology companies on the listing radar include data warehousing provider Wherescape, healthcare software developer Orion Health, transport software firm Eroad and wireless charging company PowerbyProxi.
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