Add to the API the ability to specify the layer and the transparency.
e.g.
&layer=aerial
&tp=50 (percent).
See also https://kiwiwiki.nz/pmwiki/pmwiki.php/Cookbook/NZTopoAPI

include a 'pen' button that, once pressed, allows you to draw a route on a map in a separate 'layer' which could then be saved or shared with others. Also distance could be calculated - either based on topography (if possible) or as the crow flies.

For 'adventurers' being able to say, login to topomaps nz and being able to place markers at points of interest that you can always come back and refer to at a later date would be amazing. I myself am a photographer and the option to place markers at a potential spot would be an immense addition for many people who use this service.

Cheers

Add an API parameter e.g. mapname="Mount-Ruapehu/Manawatu-Wanganui"
to allow a place name, rather than reference to be used in embedded maps

https://kiwiwiki.co.nz/pmwiki/pmwiki.php/Cookbook/NZTopoAPI

Often during "Peninsula Tramping Club" trips to this area we visit the HARPER PINNACLES. This is a popular formation up the Harper River (true Right) from the Avoca River confluence.
Picture <http://2.bp.blogspot.com/-Mx9G41bXeuY/UwFeSS6Su9I/AAAAAAAAHv8/lbILv5QV5XI/s1600/DSC02886.JPG>

This is on the Te Araroa Trail Catherine Stream closest link down river on true left <https://www.topomap.co.nz/NZTopoMap/nz31248/Catherine-Stream/Canterbury>

Such a great resource should be available for iphones too! I would use this a lot, especially with the offline availability. And yes I'm well aware of map toaster, but the overlays with aerial and satellite imagery is game changer.

Currently Street names cannot be searched for. For example Scotts Road and Mangatarere Valley Road are used to access the Tararuas. But you can't find them to plan your drive to the road end.
I suggestion that street names be added to the search, but optionally, so you might have to click a box to include street names into the search.

I was just thinking for this online researching map to make things more interesting in a local and sub-national aspect. And that is to add boundary lines for every territorial unit level within the nation of New Zealand: from regional councils to territorial authorities to wards to even area unit-level divisions (either suburbs & towns & neighborhoods on urban areas or communities & localities & settlements & villages on rural areas). Any thoughts?

Include the ability to plot a track by placing waypoints on the map to help with trip planning. Including distance, climb, descent etc.

show the depths within the lake itself

Northing and Eastings displayed on the printed map

An app where we can nominate a height above sea level and create for instance a map of NZ from say 250 meters or 500 metres.

For some reason the map is rotated -2 degrees from vertical

When "print map" is selected with the topo 50 selected, and the print option is selected as A4 portrait, for example, then the red print area should default to 10.5 x 14.85 grid squares (less about a 6 mm print margin all around). It can then be moved around by the central handle to get the best coverage of the area of interest. It is much more legible to print the maps at the scale they were intended to be printed.

Could you please add marine charts to your topo maps options
This would make it a lot easier for me to plan shore diving and fishing trips and will add to your user base.

Adding the magnetic compass cross could be very useful either there by default or as an option

Just as we make the Topo50 / 1:50,000 downloads available, make Topo250 / 1:250,000 map sheets and Garmin Custom Map / KMZ downloads available.