Appendix 02 - 2
3. Refit the case back being careful that the blue gasket is properly seated. Do not exert undue
downward force on the DZUS fasteners. Let them pull the case back into place. Switch the
unit on and check for correct operation. Screen 56 may be displayed if changes to information
featured in your flight plans are detected. Please refer to the NAV Data Card Warning in Appendix
01.
Minimum Safe Altitudes (MSA)
Included in the Jeppesen data supplied on your memory card is Grid Minimum Off Route Altitude (Grid
MORA) data. The correct use of this data is very important for terrain avoidance and hence requires
some further explanation.
This data is split into a series of one degree squares tiles for the entire world. The Grid MORA provides
reference point clearance within these tiles. Jeppesen define a reference point as a natural (peak, knoll,
hill, etc) or man-made (tower, stack, tank, building, etc) object.
Jeppesen state that Grid MORA values clear all reference points by 1000 feet in areas where the highest
reference points are 5000 feet MSL or lower. MORA values clear all reference points by 2000 feet in
areas where the highest reference points are 5001 feet MSL or higher. Grid MORAs are defined for all
areas.
In Skymap IIIC the Grid MORA information is used in two ways to derive Minimum Safe Altitudes (MSA),
firstly during flight plan building and secondly during actual flight.
Flight Plan building.
On screen 12, the Flight Plan Program / Edit Screen, as the cursor is moved up and down the flight plan,
the MSA for that leg is shown in a box below the LEG and FPLN info box as [LEG MSA: XXXX]. This
value is the highest value Grid MORA found along a ten mile wide corridor (including 5 miles past the
waypoint) centred along each leg. Also shown is the [FPLN MSA: XXXX] which is the highest value leg
MSA for the entire flight plan.
During Flight
An [MSA:XXXX] box is included on screen 41, the NAV Menu Screen. This displays the highest Grid
MORA value within a ten mile radius of your present position at all times.
WARNING:
The MSA altitudes displayed are advisory in nature only. They should not be
relied upon as the sole source of obstacle and terrain avoidance information. Always refer to
current aeronautical charts for appropriate minimum clearance altitudes.
Worldwide ICAO Codes.
In order to aid use of the Skymap IIIC, especially the area filter used during database selection
(Screens 16 and 16A), there follows a full list of all the countries and states that feature in the
Jeppesen database along with their ICAO codes, Jeppesen standard name and the data area in which
they are included (refer to the map at the beginning of this appendix).
Official Country Name ICAO Jeppesen Standard Name State Area
ACCRA FIR DG ACCRA FIR AFR
ALGERIA, P. DEMOCRATIC REP OF DA ALGERIA DZA AFR
ANGOLA, REPUBLIC OF FN ANGOLA AGO AFR
ANTANANARIVO FIR/UIR FM ANTANANARIVO FIR/UIR AFR
ANTARCTICA (AFR, INDIAN OC) F1 ANTARCTICA (AFR) AFR
ASCENSION I FH ASCENSION SHN AFR
BENIN, PEOPLES REPUBLIC OF DB BENIN BEN AFR
BOTSWANA, REPUBLIC OF FB BOTSWANA BWA AFR
BRAZZAVILLE FIR/UIR FC BRAZZAVILLE FIR/UIR AFR
BRITISH INDIAN OCEAN TR. FJ BRITISH INDIAN OCEAN TR IOT AFR
BURKINA FASO DF BURKINA FASO BFA AFR
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