Somehow I changed my format to include 4 places past the decimal while using did mm.mmm?

Somehow I changed my format to include 4 places past the decimal while using dd mm.mmm. Anyone know how to change it back to 3? This is for a gps map 64. I know that I can make the last digit 0 for the same accuracy, but I want to change it back.

0 twolpert over 3 years ago

I can only speak to the 66i. The only available format for degrees and decimal minutes IS dd mm.mmmm.

0 HamFam over 3 years ago in reply to twolpert

We’ll I’m guessing I did an update and it changed the setting. So is there a way to go back to a previous version of the software? But maybe more importantly, why would they change it to the 4 digit decimal? I’ve never seen it displayed that way anywhere. I get that it would be more accurate. But I’ve never seen anyone list it that way.

0 twolpert over 3 years ago in reply to HamFam

It has always been that way on the 66i and on all modern GPSrs. The 4th digit is actually meaningful. At 40 degrees north, .0001 degree of longitude is about 28 feet. .0001 degree of latitude is about 36 feet (uniformly). GPS should be good to 15 feet or so.

0 atlas_cached over 3 years ago in reply to twolpert

Hmmm...

How did you get those numbers?

My Geospatial calculator suggest that 00°00.0001' equates to about 0.604629 ft of latitude and 0.608610 ft of longitude at any location along the equator.

0 twolpert over 3 years ago in reply to atlas_cached

Oops. Got it from USGS, but it’s for decimal degrees, not decimal minutes. I stated it correctly but it does not address the OPs question.