Steve Ratcliffe wrote:
On 22/09/09 16:31, Steve Hosgood wrote:
On my NT map, MDR9 only contains a single 4-byte element, containing
just 01 01 00 00 just as you describe. So evidently that's an accepted
OK Thanks, that is encouraging. I shall just plough on, hoping that
is all we need in 9 for now.
This would seem to agree with the current comments on the wiki about
MDR9 - that the contents (in this case) would be a set of records in the
form <single byte integer><three byte integer>, and in this case both of
the integers are '1'. This would agree with evidence elsewhere that
seems to show Garmin's indexing usually starts from one.
I'll issue a wild guess here that MDR9 is a sort-of "chapter list" for
MDR10/11, splitting the POI list into a number of categories.
Steve - next time you're playing in this area, could you try putting in
about 10 POIs into MDR10/11 and adding a second record to MDR9 with the
value 0x02, 0x04, 0x00, 0x00 please? Then look to see if the POI search
facility has somehow split into two sections. I'd expect 3 items in one
section and 7 in the other if there were 10 items total.
It could be that the <three byte integer> is an absolute byte offset,
not an index into the POI list, but I consider this rather unlikely.
Steve
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