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for presenting the position of each waypoint are chosen by the user. Changing the format or the datum may be made at will, but too many conversions may degrade the accuracy of the data.
The position formats and datums of all the waypoints in a group can be changed in a single operation as described below.
Some information that may be relevant for choosing a datum is given when describing how to define new datums.
The following position formats can be used:
DMS
for degrees followed by minutes, both as integers,
followed by seconds as a floating point number; the degrees
value can be preceeded by a minus sign or one of the letters
N
or S
;
DMM
for degrees as integer followed by minutes as a
floating point number; the degrees value can be preceeded by
a minus sign or one of the letters N
or S
;
DDD
for degrees as a floating point number;
this value can be preceeded by a minus sign or one of the
letters N
or S
;
GRA
for centesimal degrees as a signed
floating point number;UTM/UPS
for easting zone
number, northing zone letter, easting
and northing of Universal Transverse Mercator or Universal Polar
Stereographic coordinates.
BMN
:
Austrian "Bundesmeldenetz";BNG
:
British National Grid;
BWI
:
British West Indies grid;
CMP
:
Portuguese military maps grid;
CTR
:
Italian Carta Tecnica Regionale;GKK
:
German grid ("Gauss-Krueger-Koordinatensystem")
IcG
:
Iceland grid;
ITM
:
Irish Transverse Mercator;
KKJP
:
basic Finnish grid;
KKJY
:
uniform Finnish grid;
Lamb93
:
French Lambert 93 grid;
LambNTF
:
French Lambert NTF ("Nouvelle Triangulation de France") grid;
LambNTFe
:
French Lambert NTF ("Nouvelle Triangulation de France") zone II
étendue grid;LV03
:
Swiss grid in the LV03 frame;
RDG
:
The Netherlands grid;
SEG
:
Swedish grid;
TAlbers
:
Teale Albers grid (used in California, USA);TWG
:
Taiwan grid.
MH
Maidenhead locator coordinates: this is a special kind of grid used
mainly for specifying the position of radio stations, each smallest
subdivision being 5 minutes in longitude and 2.5 minutes in
latitude. This means that conversions from other position formats to this
one will most probably loose accuracy.
The altitude
for a waypoint is given as a (possibly signed) floating point number
in either metres or feet, depending on the existing option for
this
.
are also
chosen for each
waypoint. GPSMan symbols and display options may not all be supported
by the receiver. When GPSMan is aware of this a tilde ~
will
appear before the symbol name in the symbols menu. Symbols and
display options not supported will be transmitted to the receiver as
the default values; if these are also not supported, the symbol will
be transmitted as a waypoint dot, and the display option as "Symbol
& name".
details below.
Symbols of all the waypoints in a group can be changed in a single
operation as described below.
menus and also in the following ways:
can be changed there through a menu, as described below.
Clusters of waypoints can be created by giving a group ofwaypoints to be used as centres: see below.
mig_at_ncc.up.pt
, DCC-FC & LIACC,
Universidade do Porto, 2004![]() | ![]() | ![]() | Waypoints |