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M12 Oncore Users Guide Supplement - deetc - isel

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Set User Datum Function Defines the user-defined datum stored in datum ID<br />

udatum number 50.<br />

Syntax udatum (id sma if dx dy dz)<br />

id 50<br />

sma semi major axis<br />

if inverse flattening constant<br />

dx delta x<br />

dy delta y<br />

dz delta z<br />

Example udatum 50 6378206.4 294.9786982 –7 162 188<br />

Notes Defines the constants used for a custom datum. These five<br />

parameters uniquely define a reference ellipsoid.<br />

See Also None<br />

Binary Equivalent @@Ap<br />

Ionospheric/Tropospheric Function Switches the GPS ionospheric and/or tropospheric correction<br />

Correction models on or off.<br />

ion Syntax ion ([ 0 | 1 | 2 | 3 ])<br />

0 = both models disabled<br />

1 = ionospheric model only enabled<br />

2 = tropospheric model only enabled<br />

3 = both models enabled<br />

Motorola GPS Products<br />

<strong>M12</strong> <strong>Oncore</strong> User’s <strong>Guide</strong> <strong>Supplement</strong><br />

Revision 1.0 01/25/00<br />

COMMAND DESCRIPTIONS<br />

Example ion 0<br />

Notes Default mode = 1<br />

Ionospheric model enabled<br />

Tropospheric model disabled<br />

See Also None<br />

Binary Equivalent @@Aq<br />

112

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