CO-ORDINATE CONVERSION USING SCIENTIFIC CALCULATOR

CONVERSION FROM POLAR CO-ORDINATE TO RECTANGULAR CO-ORDINATE(Change in Northing, Changing in Easting)
On Casio fx-991ES
SHIFT + [-]==> Rec( Dist, Bearing)
Press "="
Note : Be very carefully that:
A=ΔN , B =ΔE
If A is positive ΔN
else
A is negative ΔS

If B is positive ΔE
else
B is negative ΔW

CONVERSION FROM  RECTANGULAR CO-ORDINATE TO POLAR CO-ORDINATE( r=Distance , Φ=Azimuth)
On Casio fx-991ES
SHIFT + [+]==> Pol( ΔN, ΔE)
Press "="
r=Distance , Φ=Azimuth
If Φ is positive  Φ = Bearing
If else  add 360 to Φ (i.e  If Φ is negative)

FOR OTHER CASIO CALCULATORS
SHIFT +[-]==> Rec( Dist, Bearing)
Press "="
First output is Change in Northing (A)
A=ΔN
Press alpha + tan ===> it displays F
Then, press "="
Second output Change in Easting (B)
B=ΔE

Note:
If A is positive ΔN
else
A is negative ΔS

If B is positive ΔE
else
B is negative ΔW

HOW TO DETERMINE NEXT STATION POSITION(CO-ORDINATE) FROM PREVIOUS STATION
Note: This is possible when distance and bearing of previous station to next station has been converted to change in Northing , Changing in Easting, i.e conversion from polar to rectangular co-ordinate.

Nb=(Na +/- ΔNab)mN
Eb=(Ea +/- ΔEab)mE
Where
Nb= Next station Northing co-ordinate
Na= Previous station Northing co-ordinate
Eb= Next station Easting co-ordinate
Ea= Previous station Easting co-ordinate
ΔNab =Partial Northing of the two consecutive stations
ΔEab= Partial Easting of the two consecutive stations
mN= metre Northing (Units)
mE= metre Easting (Units)

On Casio fx-991ES PLUS

SHIFT + [+]==> Pol( ΔN, ΔE)
Press "="
r=Distance , Φ=Brg
If Φ is negative add 360

SHIFT + [-]==> Rec( Dist, Bearing)
Press "="
Note very carefully that:
A=ΔN ,B=ΔE
If A is positive ΔN
else
A is negative ΔS

If B is positive ΔE
else
B is negative ΔW

On Casio fx-991ES
SHIFT + [+]==> Pol( ΔN, ΔE)
Press "="
r=Distance ,
Press alpha + tan ===> it displays F
Bearing is then Displays "Brg"
If Φ is negative add 360

SHIFT +[-]==> Rec( Dist, Bearing)
Press "="
First output is Change in Northing (A)
A=ΔN
Press alpha + tan ===> it displays F
Then, press "="
Second output Change in Easting (B)
B=ΔE

Note:
If A is positive ΔN
else
A is negative ΔS

If B is postive ΔE
else
B is negative ΔW

HOW TO DETERMINE NEXT STATION POSITION FROM PREVIOUS STATION
Nb=(Na +/- ΔNab)mN
Eb=(Ea +/- ΔEab)mE
Where
Nb= Next station Northing co-ordinate
Na= Previous station Northing co-ordinate
Eb= Next station Easting co-ordinate
Ea= Previous station Easting co-ordinate
ΔNab =Partial Northing of the two consecutive stations
ΔEab= Partial Easting of the two consecutive stations
mN= metre Northing ( Units)
mE= metre Easting (Units)

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