HEMA help please

Thanks Greg, really appreciate your input.

I'm not really familiar with the HEMA operations.

I believe they also have a printed book, and you can refer to a map much the same as the street directory e.g. a page and coordinates?? They post this type of reference in the CMCA handbook.

Do you know if this is correct? Otherwise I'll just stick with the coordinates.

Thanks again.

Cheers,

Mark

Hi

Some of the Hema books/maps have coordinates (lat/long) and some have grid references (i.e. Map divided into "blocks" indentified by a page/map number then a number and a letter e.g. Map 2, Grid Block 11 C)...and some have both. If just using a grid reference you would need to also state the name of the book/map and edition as grids are not unique. I am not familar with the CMCA handbook.

Anyway - all irrelevant if you are using the Hema Naviagtor as it is a GPS and as such uses either coordinates (in a number of different formats and datums) or street addresses/suburbs/towns/cities depending on what program you fire up.

If you provide the coordinates and the street address then that should be sufficient to use on most, if not all GPS units.

Cheers
Greg

Hi

What is a "GPS ref of ...coordinates" ?

Cheers
Greg

thanks Greg : what i was trying to say was ,his coordinates are Lat -25.560392 Long 152.672024 .but my GPS south 35 34.500 east 138 45 500 what's the difference .

Hi

One is decimal degrees (e.g.-25.560392°) and the other is degrees and decimal minutes (eg 35° 34.500').

Most GPS units can accept either way (plus also degrees, minutes and seconds)...but if you want to convert yourself some simple maths involved based on the fact that there are 60 minutes in a degree and 60 seconds in a minute - so a case of multiplying the decimal bit in the coordinate by 60 to get the "true" minutes or seconds.

eg Lat -25.560392 Long 152.672024 =

-25° 33.62' / 152° 40.32' and then

-25° 33' 37.41" / 152° 40' 19.29"

To do the reverse you divide the seconds and minutes by 60 to get decimals.

Cheers
Greg

Thanks Greg :

why so many different ones ?

if you needed help what would be best for rescue in aus ?

If the GPS was set to long/lat would it comprehend east /south etc ?

sorry to hi jack your thread rv homebase .don't know if this is help in you ???

Nick b. They only appear different because the are expressed in a different mathematical way. If you hark back to your school days you would remember that a circle is 360 degrees and for more accuracy are further divided into minutes and seconds. For a detailed explanation see this Wikipedia Article

For rescue in Aus just quote any of the formats, whatever your GPS displays.

You seem confused with lat/long. Not sure what you mean by east/south etc. Lat/long is your position on the earth and North, East, South and West etc are the direction you are travelling. To confuse you further, direction can be expressed as degrees ie 0, 90, 180 and 270 etc.

Gooday Rod : You had me worried for a minute when you said remember school day's , regarding being confused !!! my hand held gps reads
S 35* 34 500' E 138* 45 500' (* degrees) I presumed S ,E , was south & east ?
lat/lon hddd*mm.mmm' (wgs 84)

regard nick

hi : as i persumed S ,E , was south & east ? just adifferent way of lat/long re wikipedea artical .

S=South of the equator (0 deg Lat), E=East of Greenwich (0 deg Long)

See here also Maptools. Lat/Long
Lat is always first and, as said, for Aus Lat = S (South) or - (minus). Long = E (East) or + (Plus or positive). If it is + the + can be omitted but - must always be used.
Hope this is of some help. Rod

Good one lads .