BendixKing SKYMAP IIIC - Manual (Page 123)

MEMORY CARDS
19. Grasp the data card by its edges and pull it straight out of its socket. Do not twist
the Card out of the socket, this could bend or break the gold pins. Being careful to
align the card with the socket then press the new card firmly into place.
20. Refit the case back being careful that the blue gasket is properly seated. Do not
exert undue downward force on the screw 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 B .
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 square 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
[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.
APPE
NDICES
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.
Rev 9 Jul 2006 C-2 Skymap/Tracker IIIC Pilot's Guide