- Map Measurer
- measures distance on maps of all scales
- distances shown in miles, kilometres and nautical miles
- durable plastic construction
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Product Description
Manufacturer's Description
This Gelert Map Measurer is the perfect walking/navigation aid, making it easy for the end user to read maps and assess distances
Product Description
Standard map measurer with dual face dial
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Customer Reviews
Most Helpful Customer Reviews
20 of 20 people found the following review helpful
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This is much easier than using a bit of cotton on the map or dental floss as I do! However, I find it reads a little short when measured against the map scale, by 3% to 5 %, despite taking up any slack in the wheel as recommended. I still use it but I calibrate it each time by achieving the same reading along the bottom of the map where the kilometer squares run in a line, and then I read the true distance from the map. Alternatively you could just up the reading by about 4%, although shorter distances have a greater error factor. Today it read 10.9K for a run I did, instead of 11.3K which is around 3% error. The other slight annoying thing is turning the needle back to zero every time you need to use it but this is probably common to all these type of mechanical map measurers. Overall, I cannot grumble for the price I paid. You might consider going for a higher priced instrument, but of course there is no guarantee of higher quality.
14 of 15 people found the following review helpful
This is the easiest and one of the cheapest ways to get a fairly accurate measurement on local maps when seeking out routes for training for distance walking/running. It is very easy to use on any scale map.
12 of 13 people found the following review helpful
The measurer is well made but it is inaccurate. It is double sided. The outer scale of side 1 represents inches to miles on the outer ring and centimetres to kilometres on the inner ring. The accuracy shows a four per cent error (low). The precision of the markings on side 1 is good.
The second side shows statute miles to the inch, km to the inch (not cm as stated on the packaging) and nautical miles to the inch (three scales, nested in circles). The scale precision is very poor, difficult to read, and the inch base makes the second side pretty well useless with modern maps.
From my view, the only useful scale is the inner cm measurer on side 1, but remember that you will have to apply the relevant conversion for 1:25,000 and 1:50,000 maps. The scale marking is 'cm to km'- true if that is the scale of the map (1:100,000).
My opinion is that these types of measurer should be dedicated to given map scales. As it is, this is nothing more than a trundle wheel and you will have to apply your own conversions. That is one possible source of error, and the accuracy of the instrument adds to the issue.
It is well made, but the design needs a re-think.
The second side shows statute miles to the inch, km to the inch (not cm as stated on the packaging) and nautical miles to the inch (three scales, nested in circles). The scale precision is very poor, difficult to read, and the inch base makes the second side pretty well useless with modern maps.
From my view, the only useful scale is the inner cm measurer on side 1, but remember that you will have to apply the relevant conversion for 1:25,000 and 1:50,000 maps. The scale marking is 'cm to km'- true if that is the scale of the map (1:100,000).
My opinion is that these types of measurer should be dedicated to given map scales. As it is, this is nothing more than a trundle wheel and you will have to apply your own conversions. That is one possible source of error, and the accuracy of the instrument adds to the issue.
It is well made, but the design needs a re-think.
Most Recent Customer Reviews
It will do
Forget about the scales on the dials, they are of little use. Use it as a rolling wheel and 'unwind' it along the scale at the bottom of the map to give the distance.
Published 25 days ago by P. M. Reynolds
Rubbish
This is a pretty bad piece of kit.
It is not at all accurate. I checked it with a ruler and there was
obvious deviation after 5cm or so. Read more
It is not at all accurate. I checked it with a ruler and there was
obvious deviation after 5cm or so. Read more
Published 7 months ago by Mr. B. Robertson
Modify The Scales
I agree with others on the limitations of the Scales on both sides of the wheel.
However it is cheap and accurate enough for most folk who leisure walk. Read more
However it is cheap and accurate enough for most folk who leisure walk. Read more
Published 7 months ago by Observations man
Better than a ruler...
A useful little device and much better than struggling with a ruler. It's a bit fiddly to use, and care is needed to get the direction of travel right (or you start at 100 and... Read more
Published 8 months ago by DudleyH
Gelert map measure
Great little item, easy to use and quite accurate. However after purchasing this little item I discovered you can get precise distances from google maps.
Published 11 months ago by andy bunyan
Gelert map measurer
Very pleased with this item, it has come in vvery useful to calculate distance on planned walks following an Ordinance Survey map. Read more
Published 21 months ago by Mrs. J. A. Prior
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