The last couple of days has seen some unusual news whereby the chief guide of the Manawatu Tramping and Skiing Club has been pointing out that some of the new Topo50 maps are wrong, following a trip they had in the Ruahines. In particular, the maps included incorrectly marked or missing tracks, and such.

The story was first penned in The Manawatu Standard, and it’s since been picked up by Morning Report on National Radio (streaming available in your choice of [Windows Media Player], [MP3] or [Ogg Vorbis] depending on your preference).

I don’t know what the errors are, and perhaps they’re especially bad. On the other hand, I wonder if the fact that the Topo50 series maps have errors means that they’re any worse than the 260 series. It’s hard to tell for sure without more information. It’s in everyone’s interests to have maps that are correct, but it’s common for NZ topo maps to have errors here and there, and sometimes it’s just necessary to accept this. The only way to really be sure about a region, short of asking someone trustworthy or going out with them, is to be prepared for anything, look at the landscape, be in a frame of mind to change plans if necessary and then learn about an area from experience.
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This post is my attempt to make sense of where the significant boundaries lie in the replacement 1:50000 Topo50 map series pushed out by Land Information New Zealand last September to replace the old 260 series. I can’t guarantee how much if it will be useful, but as always comments, feedback and experienced elaboration are welcome.

A couple of weeks ago, I took part in a bulk order of the new Topo50 maps, which replace the old 260 series that’s been in publication for several decades until now. I’m now the owner of 18 Topo50 maps to get me started, having picked up most of them for $3.50 each, around half the usual retail price. You can get this price (which includes GST but not postage) if you have a bulk order or 20 or more maps direct from LINZ, which makes it useful for clubs or groups of friends who know in advance what they want. I wrote about these maps last year, including more detail about why it’s actually happening and what the main changes are. The new maps have a couple of obvious differences:
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If you stay informed about maps, you may already know that Land Information New Zealand (LINZ) will be officially changing New Zealand’s Mapping System in September 2009. There will be several obvious changes for people who use LINZ maps for navigation, one of which is that New Zealand’s map grid will change. This is a consequence of the Geodetic Datum (from which latitudes and longitudes are derived and on which the entire maps are based) having been changed several years ago, and LINZ is finally updating its maps to catch up with its techniques. When this happens, LINZ also intends to make a collection of other substantial changes to how maps are produced, how they look, and how they’ll be used. Most obviously for people into tramping, the well known NZMS260 series (1:50000 scale) and the NZMS262 series (1:250000 scale) of maps will be completely withdrawn from publication, and respectively replaced by two new series’ of maps called Topo50 and Topo250.

LINZ has a large section of their website which describes the project in detail, explaining how it will affect people’s use of maps, GPS devices and other related systems. It’s good to see this actually happening — we’ve been hearing about it for several years now.

Everything you need to know is behind the link above, but I thought I might try to summarise the changes, perhaps to help people understand it better but as much to help myself to get a grasp on what’s changing and why. I’m doing my best to get this as correct as I can, but please keep in mind that I’m an amateur at this. If you notice inaccuracies or omissions, I’d appreciate it if you could point them out by posting a comment. If necessary, I’ll correct the post and credit as appropriate. Meanwhile if you’re keen to get more authoritative information from the source, a good place to start is the LINZ Publications & Other Resources page. The downloadable Topo50 map Reading Guide and the Where in the World Are We? booklets are especially helpful, and much of what I’ve written here is really just a dumbed down version of them.
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