So far I 've gathered that when subtype has 0x80 set no lbl pointers are given ; instead if byte 7 >&EF , ie F0 or F1 then byte 8 and 7 contain an algo for calculating the size of label that follows terminated by 0. This is followed by 3 bytes which determine the length of the information stream , depending, possibly, on the 8th bit being set . It's still a mystery: btw 0x 40 flag when set always add an extra 3 bytes Perhaps like you , I have no idea what all these bytes mean. Nick On 24/09/2014 10:39, Steve Ratcliffe [via GIS] wrote:
On 24/09/14 07:31, nwillink wrote:
To me this is what I expected looking at various NT imgs. It might mean that POIs do have a maximum of 1FF only if 7th bit of subtype is not set?
I don't know much about extended types. The mkgmap code says this for extended points:
* type is written first, then subtype. * type has no flags so its possible range is 0x0 to 0xff * subtype has two flags: * 0x20 - has a label * 0x80 - has extra bytes after the label (describes marine buoy lights etc) so the possible subtype range is 0-0x1f (as expected) * There are no flags on LBL offset.
Of course there may be other flags we don't know about and the possible range may not be fully utilised by any device.
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