- Reaction score
- 0
- Points
- 160
I have it set to display 6 finger MGRS (can go up to 10) on the 2 datums CF maps use simultaneously.
I'm not sure if I follow what you mean. Does this mean you can be using 2 datums at once?
And the CF doesn't use 2 datums exclusively. The datum used is what is indicated on the map, and that depends on where you are using the GPS (different countries have different "conventions" and within N America there are many). Here is a list of all map datums (courtesy of Garmin): http://www.garmin.com/support/faqs/MapDatumList.pdf
And here is a FAQ which also includes 2 definitions of 'datum': http://www.ngs.noaa.gov/faq.shtml
A common error and a headache for users is when you work in an area that straddles 2 maps that use different datums. The GPS info and the map info won't coincide, and people automatically blame the GPS for being wrong. Well, the GPS is telling you where it is based on the datum that you input. It doesn't know what map sheet you are using, and yes you could have the similar (looking) map sheets with different datums (always check the marginal information, particularly on older maps). And, IIRC correctly, some maps will indicate 2 different datum types for the same map.
Of course, all these observations are based on my experiences (here in Canada, from one side of the country to the other, and overseas) and what little I have read/learned. I could very well be completely out to lunch, so please let me know if I have gone outside of my boundaries.
Al