Can I obtain a New Zealand map for my NavmanF20 gps

you need a new one. C40 and C60 no longer supported. Buy Garmin instead.

We appreciate your interest in updating your Navman device. However, the C40 is one of our old models. We no longer have updates available for it. This is due to the technological advances in mapping data over the past few years. The size of the mapping data is too great to be handled by the older hardware and we are unable to release map upgrades for these devices. We sincerely apologize for the inconvenience.
The best option that we can offer is our trade-in program. You can take a chance to purchase a brand new device at a discounted price with full warranty. These new models will have the latest software and maps. And, most of the new models come with free map updates for Australia and New Zealand. You may click on the appropriate link below for more details:
Australia
https://www.navman.com.au/products/trade-in
New Zealand
https://www.navman.co.nz/products/trade-in
Thanks,
Navman Support Team

Page 98 of the C40 / C60 Manual

https://www.manualslib.com/manual/572075/Navman-C40-Series.html#product-C60-Series

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if the user manual has no information can you wifi that to a computer or get updates downloaded to the nav man ?
M-Nav 760 User Manual RoW.indd - Navmanhttps://www.navmanwireless.co.uk/wp-content/uploads/2013/.../m-nav760-manual.pd...

Then might I suggest downloading the maps for New Zealand from the Navman site. I don't own a Navman but I do own a Garmin and that's how I expand my map coverage. Cheers.
www.navman.co.nz/car-gps-devices/mapping

maps are coded to serial numbers so its unlikely that any pirated map will work

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The maps for Australia are distributed Via Navman and are Polstar. But no other maps for other brands aree compatible as they are all re jigged to only work o0n the brand of GPS's format.

Navman is distributed via **** Smith and Harvey Norman So if you dont get satisfaction from the Navman site ask the satff at one of these distributors how to purchase new maps.

No maps are free either.

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Unfortunately, the maps for this device are not free. If he didn't send you the USA map you will probably have to buy it on SD card from their website. Sorry I couldn't be more help.

why won't my computer find my navman f20 i brought a connectivity kit as they told me that would fix it but it still will not find it

I have a navman f20 sd card with US maps would be glad to make you a copy of it. [email protected]

my navman f20 has lost its sound

Try www.computerdirect.co.nz they have the best deal on the map unlock codes (especially with online cash discount)